Energy renovation is a worthwhile investment, but only if you tackle things in the right order. In Luxembourg, where Klimabonus grants can cover up to 50% of costs, strategy is crucial.
Why the Order of Works Matters
A common mistake is to start with a new heating system before insulating the property. The result: an oversized heat pump that consumes too much.
The golden rule: reduce demand before optimising heat production.
Step 1: The Energy Audit
Before any work, have an energy audit carried out. Cost: €800 to €2,000, subsidised by Klimabonus.
The audit identifies heat loss points and proposes a prioritised renovation plan.
Step 2: Insulation (Absolute Priority)
| Item | Potential Savings | Estimated Cost | Klimabonus Grant |
|---|---|---|---|
| Loft insulation | 25 to 30% of losses | €3,000 to €10,000 | Up to 50% |
| Wall insulation | 20 to 25% of losses | €15,000 to €40,000 | Up to 50% |
| Floor insulation | 10 to 15% of losses | €5,000 to €15,000 | Up to 40% |
Start with the loft: best cost-benefit ratio, payback often under 5 years.
Step 3: Windows and Doors
Ageing windows account for 15 to 20% of heat loss. For Klimabonus, a Uw coefficient of 1.0 W/m²K or less is required.
Expect €300 to €1,200 per window depending on material.
Step 4: The Heating System
Once the property is well insulated, size your new heating system. An insulated home needs two to three times less power.
| System | Max Klimabonus Grant | Estimated Net Cost |
|---|---|---|
| Air-source heat pump | Up to 50% | €7,000 to €12,000 |
| Ground-source heat pump | Up to 50% | €12,000 to €22,000 |
| Pellet boiler | Up to 40% | €9,000 to €15,000 |
Step 5: Hot Water and Ventilation
A thermodynamic water heater (€800 to €2,000) is the most efficient solution for hot water.
Mechanical ventilation with heat recovery (€3,000 to €8,000) is essential in a well-insulated home.
Step 6: Renewable Energy Production
Photovoltaic panels (€8,000 to €15,000 for 6-10 kWp) can power your heat pump.
Summary: The Right Order
| Priority | Works | Estimated ROI |
|---|---|---|
| 1 | Energy audit | Foundation investment |
| 2 | Loft insulation | 4 to 6 years |
| 3 | Wall insulation | 8 to 15 years |
| 4 | Window replacement | 10 to 15 years |
| 5 | New heating system | 5 to 10 years (with grants) |
| 6 | MVHR + hot water | 8 to 12 years |
| 7 | Solar panels | 8 to 12 years |
Find the Right Professionals on tack.lu
Each step requires qualified professionals familiar with Klimabonus. On tack.lu, describe your project and receive quotes from certified specialists.
View available heating engineers →
FAQ
Can you combine grants for multiple works in the same year?
Yes, Klimabonus allows combining grants for different types of work in the same property.
What’s the maximum Klimabonus grant amount?
For a complete renovation, grants can exceed €30,000 in favourable situations. Consult myenergy.lu for a personalised calculation.
Is a professional mandatory for Klimabonus?
Yes, it’s an essential condition. Self-build works are not eligible.
