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High heating bills or outdated systems are common problems, but a smart renovation can fix them and bring long-term benefits.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.
