Thermal modernization – Voltmax Energy Solutions in Luxembourg

We opened our first showroom in Luxembourg!

Voltmax — Mon, 20 Oct 2025 10:18:57 +0000

We're thrilled to announce the opening of Voltmax's first showroom in Luxembourg.

Munsbach, October 14, 2025 — We’ve got it! This is a significant step for us: after years of working in the country (opening in 2022), we now have a place where you can meet us, experience our solutions, and speak with the company team in person.

A ribbon-cutting ceremony, short speeches, and over 30 guests—the atmosphere was warm and energetic. The event was also attended by reporters from the Chronicle.lu portal; Ali Sahib. Most importantly, every visitor can now see our systems up close: photovoltaic panels, energy storage systems, EV charging stations, and thermal modernization solutions, including heat pumps, insulation, and facade modernization. We’ve prepared mock-ups and cross-sections to make it easier to compare the quality and differences between technologies—modules, inverters, and energy storage systems—and immediately understand how it all works together in your home. Brands you can encounter in our space include: SolarEdge, Huawei, SolarCells, Jinko, Buderus, Breeze, Sigenergy, Emultimax, Rehau, Schuco, Veka, Rockwool, Isover, and Panasonic.

Let's talk about your home: from the roof to EV charging

Technical advisors are waiting for you on-site. In a relaxed conversation, we’ll discuss your home needs: electricity consumption profile, roof options, heat pump integration, and electric car charging plan. We’ll prepare a preliminary installation concept, approximate cost-effectiveness calculations, and, if desired, arrange a site visit and discuss financing, warranties, and service. We want your visit to the showroom to be the first, concrete step towards lower bills and greater comfort.

Artur Sosna, Head of Expanse at Voltmax, and Krystian Gajda, our CEO, spoke at the opening. Guests were thanked and a symbolic “Let’s go!” was said. We’ve also announced our next goal: a second showroom in Sanem by December 2025. We’re moving quickly because we know that speed is important, and interest in renewable energy solutions is growing.

You often ask if there’s “enough sun” in Luxembourg. Our experience shows that, despite climate challenges, recent years have brought more sunny hours, which clearly favors PV energy production. This is another reason to consider your own installation—especially when you can see and discuss it here, on-site.

Voltmax originates from Poland, where we’ve been operating since 2016. In addition to Poland and Luxembourg, we’ve explored projects in the Caribbean and Latin America (Jamaica, Barbados, Panama, Cuba, Dominican Republic), participated in tenders for renewable energy sources—including large-scale energy storage—and collaborated with development organizations, including LuxDev. Approximately 85% of our projects are private; the remaining projects are for schools, municipalities, and campsites. This diversity allows us to tailor solutions to a wide range of needs and budgets.

At the end of the opening, there was time for conversation over refreshments—a most valuable moment for us, because it’s from sharing experiences and questions that the best ideas emerge.

Come, touch, compare - everything about energy in one place

We invite you to our showroom in Munsbach. Come see the quality firsthand, ask any questions, and together we’ll plan a system that will serve your home for years to come.

A personalized plan for your home. Let us know how you live and use energy. We'll prepare a proposal for solutions, including financing and warranty options.

Luxembourg Energy Passport – The Complete Guide (2025)

Voltmax — Thu, 11 Sep 2025 09:59:19 +0000

Energy passport in Luxembourg – rules, types, costs

The Most Important Thing in 30 Seconds

An Energy Passport (EPC) assesses a building’s energy performance and is mandatory for sales, rentals, and new investments, among other projects.
We distinguish categories for residential buildings (LuxEeB-H) and non-residential buildings (LuxEeB-F); in both cases, there are passports for: existing buildings, new buildings (at the permitting stage), and as-built buildings (after construction).
Key indicators include energy efficiency class, thermal insulation class, and CO₂ emissions (A+ for best → I for worst).
The standard validity of the passport is 10 years (earlier renewal recommended after significant renovations).
A well-prepared energy concept from the design stage allows for reduced construction costs and easier achievement of a high class.

What is an Energy Passport (EPC)?

An energy passport (energy performance card, EPC) is an official document that clearly presents a building’s energy performance and environmental impact. It allows for property comparisons in terms of energy consumption and CO₂ emissions and provides recommendations for efficiency improvement.

In Luxembourg, energy passports are available separately for:

residential buildings – where at least 90% of the floor area is used for residential purposes (LuxEeB-H),
non-residential (commercial) buildings – all other heated buildings (LuxEeB-F).

EPCs increase the transparency of the real estate market: buyers and tenants can estimate operating costs and climate impact before the transaction.

When is it required?

In Luxembourg, an energy passport is required in particular:

for the sale and rental of existing residential and non-residential buildings,
for new buildings – at the building permit stage (concept/notification) and after completion (as-built),
for renovations requiring a building permit or significant changes to the building’s installation/envelope.

Important Key EPC indicators must be disclosed in sales documentation and rental advertisements. Failure to obtain a current passport may delay the transaction.

Types and nomenclature: LuxEeB-H and LuxEeB-F

Residential Buildings – LuxEeB-H

Existing Building (EPC for existing) – used for sale/lease.
New Building (EPC for permit) – an appendix to the design documentation, verifying compliance with minimum and energy efficiency requirements.
As-built (after construction) – for completed projects; often required as proof for grant applications.

Non-residential Buildings – LuxEeB-F

New, existing, and as-built – similar to residential buildings.
From 2023, functional (non-residential) passports will be issued exclusively using the demand (calculation) method. Previously issued documents remain valid, but new ones can no longer be issued using the old procedure.

What does the Energy passport contain and how to read the classes?

A standard EPC for residential buildings assigns three key classes (e.g., A/A/A or F/G/F):

Energy efficiency – the building’s primary energy consumption.
Thermal insulation – the quality of the thermal envelope (walls, roof, floor, windows, doors).
Environmental impact – CO₂ emissions related to operation.

Rating scale: A+ (best) → I (weakest).

Additionally, the document includes:

annual energy consumption and projected costs,
recommended modernizations with estimated impact on the class,
a summary of building and installation parameters.

Practical tip: An Energy passport (EPC) is typically 5 pages long and covers the entire building (not a single unit, unless it is a standalone building as defined by law). The standard validity period is 10 years.

Validity, Update and Exceptions

Validity: 10 years from the date of issue.
Updating: Recommended earlier if significant modernizations have been carried out (e.g., insulation, replacement of joinery, new heating system, installation of photovoltaics, ventilation with heat recovery) – this would change the energy performance.
Exemptions: Exemptions from the requirement may include agricultural buildings, open-air commercial buildings, temporary buildings, religious buildings, and buildings with an ERA < 50 m² or with dominant process energy.

Note for non-residential buildings: Energy consumption data must be updated upon building completion and periodically thereafter (as required for the specific building type). The EPC remains valid for 10 years.

Obtaining process – step by step

Determining the EPC type (residential/non-residential; existing/new/as-built).
Data collection: drawings, partition lists, window/door specifications, installation description, test reports (e.g., blower doors), and renewable energy data (PV, collectors).
Inventory and/or on-site verification by a certified expert.
Calculation model and simulations – in accordance with appropriate methods (for non-residential buildings, including DIN V 18599).
Report and conclusions – classes, indicators, and modernization recommendations.
Issuing the document – EPC in a form compliant with regulations; forwarding to the owner/investor.

Time and cost depend on the complexity of the facility, the completeness of the data, and the scope of the on-site inspection.

Documents and data – a practical checklist

Floor plans and sections (current, with dimensions).
Enclosure list: wall, roof, and ceiling types, insulation (thickness, λ), thermal bridges.
Joinery: windows/doors with U-values, g-values, frames, thermal spacers, and installation.
Systems: heating (source, power, efficiency), domestic hot water, cooling, ventilation (recirculation, heat recovery), automation.
Renewable energy sources: photovoltaics (power, orientation, angle), thermal collectors, heat pump (ground source, SCOP).
Measurements/tests: blower-door, system control protocols, pump/unit characteristics.
Operational data (if required): meter readings, energy invoices.

The most common mistakes and how to avoid them

Lack of consistent documentation – correct any gaps before commissioning the EPC; this will speed up the process and reduce costs.
Underestimating thermal bridges – design the connection details (curtains, lintels, balconies) and their insulation.
Windows without a solar control strategy – too little winter gain or overheating in summer; consider shading (blinds, blinds).
Ventilation without heat recovery in an airtight building – increases losses and the risk of moisture.
Selecting a heat source without a profile analysis – suboptimal costs and emissions; consider heat pumps or a PV hybrid.
“Final adjustment” – think about the energy concept from the architectural concept, not the detailed design.

New building: how to design high-class?

The following principles are based on certification practice and help achieve classes A/A/A or higher.

1) Compactness of the Building Form

The smaller the surface area of the building envelope for the same cubic capacity, the lower the losses. Two-story and terraced houses usually perform better than sprawling single-story or detached houses with a fragmented form.

2) Thermal Enclosure and Airtightness

Design building envelopes with uniform, high insulation (low U-value) and analyze thermal bridges. Plan for layer continuity and the installation of joinery within the insulation layer. Confirm airtightness with a blower-door test.

3) Orientation and Glazing

Orient living areas to the south/southwest/southeast. Maximize the glazing ratio relative to the frame, maintain a high g-value (for winter gains) and provide shade in summer.

4) Construction and Thermal Mass

Choosing the technology (masonry, prefabricated, wood) to meet the insulation, airtightness, and heat storage requirements. Each has advantages and disadvantages; every detail counts.

5) Renewable Energy Sources (RES)

PV to power appliances and cover part of the heating/cooling demand.
Heat pumps (air, ground, exhaust air) as a high-efficiency source.
Solar thermal energy for domestic hot water/heating support.
Automation and energy storage – higher self-consumption and stability.

6) Comfort Ventilation System

In airtight buildings, mechanical ventilation with heat recovery minimizes losses and improves air quality; it is essential for constant, controlled air exchange.

Non-residential buildings: what you need to know

DIN V 18599 (heating, cooling, ventilation, domestic hot water, and lighting) is widely used for performance calculations.

An EPC is required for: office buildings, commercial buildings, restaurants, schools, preschools/nurseries, sports halls, hotels, swimming pools/saunas/wellness centers, and mixed-use buildings (if less than 90% of the area is residential).

Validity: 10 years as standard; periodic updates of energy consumption data are recommended, in accordance with the requirements for the specific building type.

How to improve your energy efficiency – the quickest way to achieve results

Quick wins (often without heavy work):

System adjustments and hydraulic balancing.
Leak sealing, bridge insulation (e.g., balcony slab).
Window thermal modernization (glazing units, seals, installation in the insulation layer).
Heat recovery in airtight buildings.
PV + heat pump instead of a hydrocarbon boiler (power analysis and SCOP).
Control and automation (zone thermostats, schedules, BMS).

Action	Typical effect on EPC/consumption	Approximate cost	Difficulty	Time
Regulation of installation and hydraulic balancing	-5–15% energy, sometimes +1 subclass	400–1 500 €	low	1 day
Sealing + limiting thermal bridges (local)	better tightness, fewer point losses	300–2 000 €	low–medium	1–2 days/area
Micro-thermal modernisation of joinery (seals, adjustments, warm frames, replacement of glass in frames)	−5–20% losses through windows; improved comfort	€150–600 / window (seals/adjustment) €300–1200 / sash (glazing)	average	0.5–1 day
Heat recovery ventilation (ventilation with heat recovery)	−15–30% of heating energy, higher comfort	6 000–15 000 €	medium-high	2–5 days
PV + heat pump (RES package)	large improvement in primary energy/CO₂; often +1–2 class	PV 8-12 thousand € (approx. 6 kWp) · PC 12–25 thousand €	high	3–7 days
Automation and control (zone thermostats, schedules, BMS light)	-5–15% energy; better control	€200–1500 house €1000–5000 small property	low	0.5–2 days

How to improve your energy efficiency in practice

Hydraulic Control and Balancing:
What it involves: setting flows and temperatures, throttling oversized radiators/loops, calibrating the heating curve. When it’s worth it: radiators heat unevenly, overheating of some rooms, high return. What to watch out for: missing radiator valves, dirt in the system – flush/filter first.
Sealing and Point Bridges:
What it involves: sealing installation penetrations, reveals, roller shutter boxes; insulating the balcony slab, tie beams, and lintels. When it’s worth it: noticeable drafts, dampness at corners. What to watch out for: do not impair natural ventilation in leaky buildings – consider air vents or heat recovery.
Micro-Modernization of Joinery:
What it involves: replacing/sealing seals, adjusting fittings, warm edge spacers; Where possible, replace only the glass with low-emissivity glass in the existing frames. When is it worth it: relatively new windows, but they are “breezy”/fogging; no budget for a full replacement. What to look for: correct installation (in the insulation layer), bridges on the window sills.
Heat Recovery What is it:
mechanical ventilation with heat recovery (75–90% efficiency). When is it worth it: the building is already airtight or planned to be airtight; moisture/CO₂ problems. What is it worth: duct routing design, acoustics, regular filter replacement.
PV + Heat Pump What is it:
generating electricity from PV and using it to power a heat pump for heating/DHW. When is it worth it: replacing an old boiler, roof availability, cost-effective tariff; desire to improve primary energy efficiency and CO₂ emissions. What to look for: power selection (SCOP, bivalence), storage tank, space for an outdoor unit; check available subsidies.
Automation and Control:
What it involves: zone thermostats/programmable thermostats, schedules, weather curves, occupancy sensors/open windows; in small buildings – a simple BMS. When it’s worth it: a building heated “constantly,” no zoning, irregular use. What to watch out for: overly aggressive schedules = discomfort; introduce hyseresis and exceptions.

Mini-wins that often pay off the fastest:

lowering the domestic hot water temperature (while maintaining hygiene), circulation timers,
insulating pipes in unheated spaces,
aerators and faucet aerators,
optimizing heat source settings (curve, supply/return temperatures).

Tip: Combine actions (e.g., seals + heat recovery + automation). Synergy usually provides a class-leading improvement greater than the sum of the individual effects.

FAQ – Frequently Asked Questions – Frequently Asked Questions

How long is an Energy passport issued for?

Typically, it's valid for 10 years. After a significant renovation, it's worth updating it sooner.

Is an EPC required to advertise a sale/lease?

Yes – key indicators should be disclosed in marketing materials.

What's the difference between a "permit-based" and an "as-built" EPC?

The former is created at the design stage and confirms compliance with requirements; the latter applies to a completed building and may be a condition of subsidy.

What are the penalties for not having an EPC?

Regardless of the penalties, the lack of a document can block a transaction or delay commissioning. Place your order in advance.

Does an EPC apply to units in multi-family buildings?

Generally, an EPC is issued for the entire building. Units are subject to separate rules only in specific cases.

Are the cost data in the EPC "definitely" my costs?

These are estimates based on assumptions and standard profiles; actual bills depend on usage and energy tariffs.

Will photovoltaics improve my energy efficiency class?

Usually yes, especially when combined with a heat pump and heat recovery – this affects primary energy and emissions.

What about temporary/agricultural buildings?

Many such structures are exempt from the requirement – check the qualification before commissioning an EPC.

Contact us

We are Voltmax – we specialize in photovoltaic installations for homes, communities, and businesses in Luxembourg (including PV carports and EV chargers). We work with certified energy auditors – we will help you:

compile EPC documentation,
plan upgrades to upgrade your energy class,
design and install PV/heat pumps for real cost and emission reductions.

Take the first step: Schedule a free consultation

How to stop street noise and bring quiet back into your life

Voltmax — Thu, 14 Aug 2025 08:07:13 +0000

Silence is a modern luxury

Noise is everywhere these days, on busy streets, in city centres, and even in quiet suburbs. The constant sound of cars, noisy neighbours, and garden tools can seriously disturb your everyday life. As a result, more and more people are having trouble sleeping and staying focused. Studies show that noise can even lead to high blood pressure and nervous system problems. All in all, silence is becoming rare and valuable. That’s why it’s worth thinking about how to bring more of it into your home.

Your windows: the first defence against noise

Not everyone knows that good-quality windows can make a big difference when it comes to blocking outside noise. In other words, windows are more than just frames and glass. With the right design, like special glass and tight seals, you can reduce unwanted sounds by dozens of decibels. For example, laminated glass with an acoustic layer can act like a shield for your home. If outside noise is getting in through weak spots or gaps, your comfort drops quickly. So, investing in better windows means investing in peace of mind.

You have decided to replace your windows? Make a smart choice

Now that you know windows can help protect you from outside noise, it is time to take action. In this situation, your choice should not be random. There are many types of windows on the market, each with different features and construction. Not every PVC window will be as effective as a wood or wood-aluminium one. After that, it makes sense to follow a simple and logical decision-making process. To help with that, let us guide you through five key steps.

Step 1: Think about what matters most to you – silence, warmth or appearance

The first step in choosing the right windows is asking yourself what you really expect from them. Think about whether your top priority is peace and quiet, keeping your home warm or improving the look of your house. After all, different windows solve different problems. If you live near a busy street, noise reduction should be at the top of your list. If your house is energy-efficient, then you cannot ignore the thermal insulation rating, also known as Uw.

For families with children, safety might be just as important. In this case, look for RC-rated security glass and child-safe handles. Many people also care about how windows look, and that is completely understandable. The shape, colour and style of your windows often define the entire look of your home. Altogether, setting your priorities early will help you avoid confusion later when comparing offers. It will also make talking to a window expert or architect much easier. To emphasize, asking the right questions from the start can save you a lot of stress in the end.

Step 2: Choose your window type – the material matters

There are several types of windows available, and they differ not only in appearance but also in how they perform. First, the most common option is PVC windows. They offer good insulation and come at a budget-friendly price. In addition, they are lightweight, easy to clean and available in a wide range of colours. However, not everyone likes their plastic frames. If you prefer a more natural style, wooden windows might be a better fit, although they do require regular care.

Still, wood is a great insulator when it comes to both heat and noise. Aluminium, on the other hand, is a top choice for fans of modern design, especially when you want large glass areas with slim frames. It is often used in contemporary architecture where durability and minimalism are key. It is also worth considering hybrid windows, such as wood-aluminium models. Accordingly, they combine the warmth and beauty of wood on the inside with the weather resistance of aluminium on the outside. Each material has its strengths and weaknesses, and it is important to evaluate them based on your specific needs. To that end, the best solution is one that balances function and design – there is no need to choose between the two.

Step 3: Pay attention to technical specifications

The technical features of your windows play a key role, especially if silence and warmth are important to you. For instance, the Rw value tells you how well a window blocks outside noise. The higher the number, the better the sound insulation inside your home. On the other hand, the Uw rating shows how much heat escapes through the window. The lower the Uw, the more energy-efficient your home will be. As a result, a good window helps you enjoy both quiet and lower energy bills. It really pays off to choose models that offer both benefits. After all, home comfort starts with silence and warmth.

Besides Rw and Uw, there are other important values to consider, such as water resistance and air permeability. For example, class 9A means your window offers high protection against wind and rain. You should also check its burglary resistance level – RC2 is a solid minimum for most homes. These technical specs are not just theory. In reality, they show how well the window will perform once installed. To sum up, read the technical data carefully. It tells you what you can truly expect from your windows.

Step 4: Choose the right glazing package

The number of glass panes has a direct impact on both heat and sound insulation. Generally, triple-glazed windows offer much better protection than double-glazed ones. That is why it often makes sense to spend a bit more, especially if you live in a noisy area. For this reason, a triple-glazed unit filled with noble gas between the panes usually works best. It helps keep noise and heat loss to a minimum. In short, it is an investment that pays off quickly by giving you more comfort every day.

Modern glazing can also offer extra features such as acoustic films or solar coatings. Not only do they help reduce noise, but they also add safety to your home. Frosted or patterned glass is great for maintaining privacy in bathrooms. Tinted glass can prevent rooms from overheating on sunny days. All in all, glazing is not just about how the window looks, it also affects how it works. In brief, good glass works quietly in the background to make your life more comfortable.

Step 5: Do not forget about proper installation and sealing

Choosing the right window is only half the job. In other words, even the best window will not perform well if it is installed incorrectly. Poor installation can let in cold air, moisture and noise. Consequently, the window will lose its thermal and acoustic properties. For that reason, it is important to hire a skilled team that knows how to use layered installation methods. This technique involves using different sealing tapes on the inside and outside, with each one serving a specific purpose. To be sure, simply filling the gap with foam is no longer enough. A professional installation protects not only your comfort but also the long-term durability of your windows.

The most common mistakes when choosing windows – and how to avoid them

Many people choose windows on impulse, for example because of a sale, an ad or simply because they like how they look. After all, who does not like beautiful things? But in reality, the technical details matter most. A common mistake is focusing only on the price. Cheaper windows often provide worse thermal and sound insulation. As a result, they can end up costing you more in the long run. Others forget to check quality certificates or choose products without a warranty. In this case, you risk faster wear and no support if something goes wrong. All things considered, it is better to stay calm, ask questions and make a well-thought-out decision.

Another common mistake is not thinking about where and how the windows will actually be used. For example, the right window for a busy city street is not the same as one for a quiet village. Noisy locations require better acoustic glass with a higher Rw rating. Homes in windy areas need stronger seals and durable hardware. That is why it is always worth analysing your building’s surroundings. To conclude, you should choose your windows based not only on the room they are in, but also on the environment outside.

Summary

The right windows are not just a design feature, they can truly improve your everyday life. In summary, silence, warmth, energy savings and appearance all come together in a well-chosen window. The technical specifications, proper installation and the right glazing package form a complete solution. For that reason, it is worth taking the time to think about your needs and your home’s specific conditions. After all, comfort at home affects your health and peace of mind. Good windows will serve you for years without compromise, which is why this choice should be seen as an investment, not just an expense. Not to mention, high-quality windows can also increase your property’s value. So choose a solution that works quietly for your comfort every single day.

If you are not sure where to start, just reach out to a Voltmax advisor. In other words, you do not need to know the details of Rw or EPDM, all you need to do is describe what matters to you. So take the first step toward a quieter and more comfortable home.

Tired of street noise? Let us help you choose windows that bring peace and comfort – fill in the form today and get your free consultation.

Home Insulation with Subsidies in Luxembourg – Less Heat Loss, More Money in Your Pocket

Voltmax — Mon, 21 Jul 2025 08:05:51 +0000

Insulation - the First Step to Saving Energy

Why does insulation have the biggest impact on energy consumption and living comfort?

Thermal insulation is one of the most effective ways to reduce energy loss in a building. It’s estimated that up to 60% of heat can escape from a house through uninsulated walls, roofs, floors, or leaky windows. The older the building, the greater the losses – and the higher the heating bills.

Proper insulation not only retains warmth in winter, but also protects against heat in summer, significantly improving year-round comfort. As a result, you consume less energy – regardless of whether you use gas, a heat pump, or electric heating.

A well-insulated home also means:

stable indoor temperatures,
less moisture and mold,
lower wear and tear on heating and cooling systems,
increased property value.

That’s why insulation isn’t just a cost – it’s a smart investment that starts to pay off from day one. And thanks to government subsidies, it’s achievable even with a limited budget.

Where Does Most Heat Escape?

Loss Analysis: Roof, Walls, Floors, Windows and Doors – What to Watch For in Older Buildings

Before starting a home renovation, it’s essential to understand where energy is being lost. In a typical uninsulated or poorly insulated building, the greatest heat losses occur through:

Roof – up to 25–30% of total losses.
Warm air rises, and without proper insulation in the attic or roof slope, it literally “escapes into the sky.”

External walls – another 20–25%.
Old walls without insulation, or with a thin layer of outdated materials, often fail to meet today’s energy efficiency standards.

Windows and doors – up to 15%.
Leaky frames, outdated glazing units, and missing seals all contribute to significant energy loss.

Floors and basements – up to 10%.
Especially when the house is built directly on the ground or above unheated spaces.

Thermal bridges – places where the insulation layer is interrupted by structural elements (e.g., balconies, lintels, corners).They can lead to local heat losses and even moisture condensation.

In buildings constructed before the year 2000, insulation is often completely absent or extremely insufficient. That’s why these homes benefit the most from energy upgrades – both in terms of efficiency and financial return.

The first step should be a thermal diagnosis, ideally through a professional energy audit, which will clearly identify which parts of the building require intervention.

Thermal Modernisation Is Not Just About Staying Warm in Winter

How Proper Insulation Helps Keep Cool in Summer and Improves Indoor Climate

While most people associate insulation with protection from the cold, a well-insulated home works both ways – it retains heat in winter and prevents overheating in summer.

On hot days, when the roof or walls are heated by the sun, poor insulation allows this heat to penetrate inside, raising indoor temperatures. That’s when fans and air conditioners kick in – or you’re simply left to endure the discomfort. But with the right insulation layer – especially in the roof and external walls – the heat transfer is limited, keeping interiors cooler and thermally stable.

Insulation also improves the indoor microclimate – the air isn’t too dry or too humid, and it’s easier to maintain an optimal temperature and airflow. In well-insulated buildings, heating and cooling systems operate less frequently and under less strain, which translates into lower bills and longer equipment life.

Thermal comfort also means better conditions for work, sleep, and daily living – which is especially important today, as many people spend more time at home, often working remotely.

What Are the Most Commonly Used Insulation Materials?

An Overview of Technologies Available on the Luxembourg Market – Mineral Wool, PUR Foam, Cork, Insulation Boards

Choosing the right insulation material is a key element of effective thermal modernisation. The Luxembourg market offers a wide range of solutions – from traditional to eco-friendly options. The best choice depends on the area to be insulated (e.g. roof, external walls, foundations), the desired performance, and the available budget.

Mineral Wool (Glass or Rock Wool)
One of the most widely used insulation materials for roofs, attics, and walls. It offers excellent thermal and acoustic insulation and is fire-resistant. However, it can be sensitive to moisture, so proper vapor barriers are necessary.

Polyurethane Foam (PUR)
PUR foam is a modern spray-applied material, ideal for hard-to-reach areas. It provides high airtightness and a very low thermal conductivity. Downsides include a higher cost and low vapor permeability, which requires good ventilation in the building.

Natural Cork
An eco-friendly solution used in roofs, floors, and walls. Cork is mold- and fungus-resistant, offers thermal stability and good soundproofing. However, it’s a more expensive and less widely available material compared to standard technologies.

Insulation Boards (EPS, XPS)
Expanded polystyrene (EPS) and extruded polystyrene (XPS) are popular choices for foundations and façades. They’re lightweight, cost-effective, and easy to install. Their drawbacks include low vapor permeability and limited acoustic insulation.

Natural and Recycled Materials
These have grown in popularity in recent years, especially in projects supported by Klimabonus and similar programs. Examples include cellulose, wood fiber, hemp, and sheep wool. Their advantages: low CO₂ emissions, moisture regulation, and renewable origin. However, they may come with higher costs and more complex installation requirements.

It’s worth noting that some subsidy programs in Luxembourg offer higher grants for the use of eco-friendly or recycled insulation materials. That’s why, when selecting a solution, you should consider not only the technical specifications, but also the eligibility criteria of available funding programs.

Financial Support for Insulation - What Subsidies Can You Access?

Home insulation is one of the most cost-effective elements of energy-efficient renovation – but it often involves a significant upfront expense. Fortunately, various financial support schemes are available in Luxembourg that can greatly reduce the total investment cost. Some come in the form of non-repayable grants, others as low-interest loans or tax incentives.

The main subsidy program currently in place is Klimabonus, which supports the thermal renovation of residential buildings. Homeowners can receive up to 62.5% reimbursement of costs related to insulation work on roofs, external walls, floors, as well as window and door replacements. The program offers even higher support for eco-friendly materials and for buildings that achieve low energy consumption after renovation.

Additionally, there are climate loans – government-supported financing solutions for energy upgrades. These loans are often interest-free and can be repaid over long terms, up to 15 years.

Homeowners may also benefit from a tax deduction for energy renovation works and a reduced VAT rate (3%) on services related to upgrading their primary residence – up to a certain cost threshold.

Some previous programs, such as PRIMe House, have been integrated into the new schemes, but transitional rules still apply to projects started under the older regulations.

All these support mechanisms share a common goal: to encourage Luxembourg residents to improve the energy efficiency of their homes. Thanks to these incentives, homeowners can undertake renovations that not only lower their monthly bills but also increase property value and enhance overall living comfort.

Conditions for Receiving Financial Support - Who Can Get Funding and for What?

Criteria, Income Limits, Types of Buildings and Eligible Renovation Works

Grants for thermal renovation are available to owners of residential buildings in Luxembourg that are at least 10 years old. The support applies to both private individuals and housing associations – provided the building is used as the primary residence.

The funding covers, among other things, the insulation of roofs, walls, ceilings, floors above basements, as well as the replacement of windows and doors, and the installation of mechanical ventilation systems with heat recovery. The works must meet specific technical standards, and an energy audit must be carried out and approval obtained before starting.

The amount of the grant may depend on the type of materials used (with higher support for eco-friendly solutions) and the financial situation of the household. Some programs include income limits, and the entire procedure requires that the beneficiary lives in the renovated building for at least two years after the completion of the works.

From Energy Audit to Grant Payment - How the Process Works (and How Voltmax Helps)

Although the idea of applying for financial support may seem complicated, the process is actually well-structured – as long as you know the necessary steps and have the right support. That’s why working with an experienced partner like Voltmax makes the entire journey much simpler – from the initial consultation to the final grant payout.

The process begins with a professional energy audit. A certified expert evaluates the technical condition of the building, identifies the areas with the greatest heat loss, and recommends specific actions. At this stage, the so-called technical documentation is also prepared – it serves as the foundation for applying for support from programs such as Klimabonus.

Based on the audit, a formal application for a conditional agreement (agreement-in-principle) is submitted. This agreement is a required step under the Klimabonus program – it confirms that the planned renovation meets the funding criteria and is a prerequisite for claiming reimbursement later on.

It is important to note that this agreement does not replace any necessary building permits or declarations required by local municipalities. These are two separate procedures – one deals with building regulations, the other with funding approval. Voltmax supports clients with both aspects, helping to prepare all documents required by local authorities when needed.

At this stage, accurate documentation is key. The application must include audit results, the planned scope of work, technical details, and a cost estimate. Voltmax assists clients throughout the entire process – from paperwork to communication with institutions.

Once approval is granted, the renovation work begins. Voltmax carries out the full scope of work – from wall, roof, ceiling, and floor insulation to window and door replacements, and installation of mechanical ventilation systems. Throughout the process, the company ensures full compliance with technical standards required by the grant authorities.

After the work is completed, a final grant application is submitted. This includes invoices, photos, proof of completion, and a report on the project. Voltmax prepares the entire closing documentation, so clients don’t have to handle the paperwork on their own.

Finally, once the application is verified and approved by the authorities, the funds are transferred directly to the client’s bank account. The subsidy can cover up to 62.5% of eligible costs, depending on the type of renovation, materials used, and additional criteria – for example, bonuses for using ecological materials.

Conclusions - Why It Pays to Act Now

Energy prices are rising, regulations are changing, and public funding is limited – delaying action could cost you more than you think.

Investing in insulation and energy-efficient upgrades is not just about enhancing comfort. It’s a practical and forward-looking response to a shifting economic and regulatory landscape. Energy costs have steadily increased in recent years, and all forecasts point to a continued upward trend. The longer you wait, the more you’ll pay in monthly bills.

At the same time, new building codes and efficiency standards may soon require mandatory compliance from homeowners. By acting now, you take initiative on your own terms, while still being able to benefit from generous subsidies.

Keep in mind that programs like Klimabonus are time- and budget-limited. Some incentives are only valid until a specific date or until available funds run out. Submitting your application early gives you the best chance of securing maximum financial and technical support.

Need Insulation? Contact Voltmax

If your home needs renovation, don’t wait – now is the perfect time to take advantage of available subsidies and reduce your investment costs by up to 60%.

Voltmax supports you every step of the way – from the energy audit and technical documentation, to obtaining approvals, completing the work, and handling the grant reimbursement.

Get in touch with us today – we’ll provide a free preliminary estimate and check which funding options you may qualify for.

Save energy and cut costs with the right insulation. Fill in the form and claim your free audit with subsidy guidance today

Thermal Modernisation in Luxembourg: A Smart Way to Cut Bills

Voltmax — Wed, 02 Jul 2025 12:18:39 +0000

Introduction

In a time of rising energy costs and growing environmental awareness, improving your home’s energy efficiency matters more than ever. For homeowners in Luxembourg, thermal modernisation is a practical way to cut energy use, lower bills, and stay comfortable all year.

To begin with, you can start by insulating walls and roofs, upgrading heating systems, or installing solar panels. The good news? Luxembourg doesn’t just support these efforts—it helps fund them.

Moreover, with generous grants at both the national and local levels, energy renovation has never been more accessible. Whether you own a house, duplex, or apartment, it’s not just a green choice—it’s a smart financial move.

In this case, thermal modernisation delivers both environmental and economic benefits. What’s more, it increases the long-term value of your home.

In this guide, we’ll show you what thermal modernisation involves, why it matters, and how to get started. Let’s explore how to make your home warmer, greener, and more cost-efficient—step by step.

Renovating your home in Luxembourg: where energy savings begin

Every energy-saving journey starts with the home itself. In Luxembourg, energy-focused renovation isn’t just about aesthetics or property value—it’s about making your space more affordable, comfortable, and efficient.

High heating bills or outdated systems are common problems, but a smart renovation can fix them and bring long-term benefits. The government of Luxembourg actively promotes thermal renovation as part of its national climate and energy strategy.

Projects like insulation, window replacement, and heating upgrades can reduce energy use and turn your house into a low-consumption home. Moreover, renovation doesn’t have to happen all at once. Many homeowners start with small steps and upgrade gradually.

As a result, generous grants, expert advice, and a growing number of skilled contractors have made starting your renovation easier than ever.

Stopping heat loss: the real problem in older buildings

Older buildings in Luxembourg often come with character — nevertheless, they also hide energy leaks. Many homes built before modern insulation standards lose heat through walls, roofs, windows, and even floors.

In some cases, more than half of the heating energy escapes through the building envelope. This doesn’t just make homes colder in winter and hotter in summer — it also drives up energy bills.

Heat loss also increases your home’s environmental footprint. What’s more, many homeowners don’t realise how much energy they’re losing until they look closely at their usage.

Thermal imaging and energy audits are great tools to find the weak spots. Once identified, you can take focused action — starting with insulation and sealing.

Fixing heat loss in older buildings isn’t just about comfort. On the contrary, it’s the foundation of any successful energy renovation. Without it, even the best heating system or solar panels won’t work as intended.

Insulating walls, roofs and floors to keep the heat inside

Proper insulation is one of the most effective ways to stop heat loss and reduce energy use. In particular, this is true in Luxembourg’s varied climate.

Without good insulation, even the most advanced heating system will struggle to keep your home warm in winter or cool in summer. Walls, roofs, and floors are the most common areas where heat escapes. As a result, upgrading their insulation can lead to noticeable energy savings.

External wall insulation can cut heat loss by up to 25%. Roof insulation alone can prevent up to 30% of thermal energy from escaping.

Floor insulation — especially above garages or unheated cellars — adds extra protection and comfort. Altogether, these improvements deliver the best results. Fortunately, Luxembourg offers strong financial support for such projects. National and local subsidies cover a large part of the cost.

What’s more, with efficient materials and clear energy standards, professional insulation is now a reliable way to save energy and reduce your bills.

Replacing windows and heating systems for better efficiency

Old windows and inefficient heating systems are major obstacles to a truly energy-efficient home. In many Luxembourgish buildings — especially older ones — single-glazed or poorly sealed windows let valuable heat escape.

Outdated boilers and electric radiators also waste energy without providing consistent comfort. Replacing windows with double or triple-glazed models and insulated frames helps keep the heat in and the cold out.

These thermal modernisation upgrades also improve soundproofing and indoor comfort year-round. Moreover, switching to high-efficiency systems, like air-to-water or geothermal heat pumps, can cut energy use by up to 50%.

The cost may seem high at first. However, Luxembourg’s financial support schemes make these upgrades more affordable. In fact, when done together, window and heating system upgrades can unlock extra bonuses through national renovation programs.

Most importantly, they help your home stay efficient and reduce its environmental impact.

Adding solar panels to boost efficiency and cut electricity costs

Once your home is well insulated and your heating system is upgraded, the next step is often solar power. To put it another way, installing photovoltaic (PV) panels lets you generate clean electricity and lower your energy bills.

Solar energy is especially attractive in Luxembourg, where the government offers generous incentives. Modern solar panels are efficient, long-lasting, and adaptable to most roof types and building sizes.

As a matter of fact, by producing electricity at home, you not only save money — you also protect yourself from future energy price hikes. Pairing PV systems with heat pumps or EV chargers can further reduce your carbon footprint.

All in all, this combination offers a powerful step toward energy independence. Eventually, in many cases, homeowners recover their investment within 8 to 12 years.

Available grants in Luxembourg for energy renovation projects

Homeowners in Luxembourg benefit from a wide range of financial incentives that make energy renovation more affordable. The main support scheme, Klimabonus, covers up to 62.5% of eligible costs for thermal modernisation works like insulation, heat pumps, window replacement, or solar panels. This applies when the energy class improves by at least two levels.

In addition, other programs include Enoprimes (from energy suppliers), low-interest climate loans, and a reduced 3% VAT for older homes. In some municipalities, you can also get local top-up grants covering 10–20% of your renovation costs.

A state-funded energy audit is partly reimbursed, making expert advice easier to access. As a result, these supports can reduce the total cost of deep renovation by up to 60–70%, especially when upgrades are combined.

Your step-by-step plan for a thermal modernisation and more efficient home

Starting an energy renovation project can feel overwhelming. However, in Luxembourg, there’s a clear path to follow.

The first step is to schedule an energy audit with a certified expert, often subsidised by the state. This evaluation will show where your home is losing energy and what to fix first.

After that, create a renovation plan based on the audit. Many homeowners begin with insulation—walls, roof, and floors—then move on to windows and heating systems. Once energy loss is reduced, you can add solar panels to generate clean electricity and save even more.

With this in mind, at Voltmax, we support you every step of the way. From the energy assessment to planning, installation, and grant applications—we handle it all. With the right partner, going green has never been easier or more rewarding

Conclusions

Thermal modernisation is more than just a home improvement trend in Luxembourg. It’s a long-term investment in comfort, savings, and climate responsibility.

Every upgrade—from insulation and heating to solar power—brings you closer to an efficient, sustainable home. Luxembourg has one of the best grant systems in Europe, making it easier than ever to take action. And you don’t have to do it alone.

At Voltmax, we guide you through the entire process. We help you make the right decisions, secure available subsidies, and complete your renovation with confidence.

A warmer, greener, and more cost-efficient home is not only possible—it’s within reach.

Lower your energy bills with smart thermal modernisation. Fill in the form and get a free audit with expert advice on subsidies in Luxembourg

OPEN DAY 2025

Voltmax — Wed, 12 Mar 2025 14:01:30 +0000

Luxembourg opens the 2025 photovoltaic season! Come to the Open Day with Voltmax, SolarCells and Andy Schleck

Take advantage of the unique opportunity of the Open Day and spend a nice Saturday.

📅 Saturday, 29 March 2025 | 12:00 – 17:00
📍 Andy Schleck Cycles,
📍 2, rue des Prés, L-5972 Itzig

Luxembourg is entering a new renewable energy season! On March 29, residents will have a unique opportunity to learn how to use solar energy and take advantage of available subsidies for photovoltaic installations and home renovations.

Voltmax, an expert in photovoltaic installations, together with the Luxembourg solar panel manufacturer SolarCells and Andy Schleck, winner of the Tour de France and entrepreneur, invite all interested parties to the Open Day inaugurating the 2025 photovoltaic season.

This is a great opportunity to learn how to reduce your electricity and heating bills, modernize your home and increase its energy efficiency.

🔆 What attractions await participants?

🔹 Free consultations with Voltmax experts on:

✅ Photovoltaics and possibilities of subsidizing the installation,
✅ Choosing the right PV system for your home,
✅ Learn about the specifications and benefits of Luxembourg Solar Cells panels
✅ Energy storage and hybrid solutions.

🔹 Thermal modernization advice – learn how to:

🏡 Reduce heat loss and improve building insulation,
🔧 Replace the roof, windows and doors with more energy-efficient ones,
💡 Reduce heating costs and optimize energy consumption.

In addition:

🔹 Meet Andy Schleck – cycling legend and owner of bikes shops.
🔹 Refreshments and a glass of champagne – because talks about the future of energy should take place in a pleasant atmosphere!
🔹 Competitions with attractive prizes! 🎁

🌿 Time for a green change in Luxembourg!

Thanks to the support of the government of the Grand Duchy of Luxembourg, residents can take advantage of numerous subsidies and reliefs for photovoltaic installations and modernization of their homes. The Open Day is the perfect time to find out what steps are worth taking to get more from solar energy and make your home more energy-efficient.

💡 FREE ADMISSION – come and benefit from the knowledge of experts!

Come, find out how you can use the potential of the sun and start the new season with energy! 🔆♻️

Missed our Open Day with Andy Schleck? No worries — you can still take the lead in renewable energy by choosing your own installation today and start reaping the benefits