Heat pump grant 2026 in Luxembourg: amount, conditions, procedure

Between €6,000 and €12,000 for an existing house, depending on the technology and on what the heat pump replaces. Order between 1 January 2026 and 30 June 2027 and the State adds €2,000. Here is the official Klimabonus 2026 scale for a single-family house:

Source: guichet.lu, Klimabonus 2026 regime.

In an apartment building, the grant is calculated per dwelling: €8,000 (€10,000 with the bonus) for air-to-water and €10,000 (€12,000) for geothermal, with a cap per building. Air-to-air heat pumps, in other words reversible air conditioning, are not subsidised.

The word that changes everything: replacement. If your heat pump takes an oil, gas or coal boiler or a direct electric heater out of service, you receive the full amount. Otherwise the State deducts €4,000 in a single-family house.

Four main conditions: a home in Luxembourg that you own, a new heat pump that reaches the minimum efficiency, a professional installation by an established company, and an invoice dated between 1 January 2026 and 31 December 2030.

On the technical side, the 2026 regime sets precise thresholds:

• Efficiency (COP, EN 14511 standard): at least 3.1 for an air-to-water heat pump (A7/W35) and 4.3 for geothermal (B0/W35).
• Flow temperature: 35 °C at most, otherwise the COP must be reached at the chosen temperature. In an older house with radiators, this is the first point to check.
• Hydraulic balancing of the heating network, a dedicated electricity meter and a heat meter.
• Buffer tank of at least 30 litres per kW in an existing building, except for power-modulating pumps.
• Noise: the outdoor unit of an air-to-water pump must stay within 48 dB(A) up to 5 kW, 51 dB(A) up to 12 kW and 55 dB(A) above, or below 40 dB(A) at the boundary of the neighbouring plot.

Since 2026, the old boiler no longer needs a minimum age. Second-hand units and partial repairs remain excluded. A good installer knows these thresholds by heart: it is up to them to choose a compliant model and fill in the certificate of conformity.

No. For a heat pump there is no prior application: you order, you have it installed, then you file the application with the paid invoices. The order date and the invoice date set the amount.

The dates to remember:

• Order between 1 January 2026 and 30 June 2027 for the €2,000 bonus, provided the invoice is issued by 31 December 2028 at the latest.
• Invoice between 1 January 2026 and 31 December 2030 for the 2026 regime, up to 31 December 2035 if the heat pump is part of an energy renovation.
• Filing within 4 years after 31 December of the invoice year. Beyond that, the right is lost.

An important new rule: the company commissioning the heat pump must request the acceptance inspection from the Chambre des Métiers within the following month. Proof of this appointment request is part of the application. Ask your installer for it at commissioning.

Five steps, and the installer handles most of them:

1. Compare quotes. Ask for at least two or three detailed offers with the model, the COP, the output and the planned flow temperature. A heat loss calculation avoids an oversized pump.
2. Order and have it installed. Keep the order form. The installer commissions the unit, balances the hydraulics and requests the acceptance inspection.
3. Gather the documents. Form DEPA-2026, annex POCH-2026, certificate of conformity CCPOCH-2026, detailed and paid invoices with proof of payment, recent bank details (RIB), proof of the acceptance request.
4. File on MyGuichet.lu. With LuxTrust or the eID card, in a few minutes. Registered mail remains possible.
5. Wait for payment. The administration processes applications in order of arrival. A complete file avoids back-and-forth.

From 1 January 2027, pre-financing arrives: a company listed in the register of intermediary applicants will be able to deduct the grant directly from your invoice. Until then, you advance the amount.

Several, and they change the final bill:

• 3% VAT on the complete installation (pump, hydraulics, emitters, labour) for a home at least 20 years old used as the main residence. Benefit capped at €50,000 per home, to be requested, never automatic.
• Klimaprêt: a 1.5% interest subsidy on a climate loan to finance the rest.
• €2,000 extra if you replace an oil boiler in a water protection zone.
• €1,500 for removing, neutralising and recycling the oil tank, on an invoice from a specialised company.
• Up to €2,000 (or 50% of the costs) to adapt the heat distribution system, for example low-temperature radiators.
• Municipal grants: many municipalities add their own grant. Ask yours before ordering.

Combined, these aids can cover more than half of a standard installation. Our subsidies guide details each of them.

Often less than half of the quote. There is no single price: each installation is priced after a visit and a heat loss calculation. For an existing house, quotes for an air-to-water heat pump frequently fall between €18,000 and €30,000 including VAT, more for geothermal because of the drilling.

An example with a 1990s house heated with oil, ordered in 2026:

The grant amounts are those of the 2026 regime; the price and the municipal grant are examples.

Add the heating savings. In a properly insulated house, a well-sized heat pump cuts the bill clearly compared with oil or gas. Our heat pump subsidies page gives the orders of magnitude.

Three mistakes come up again and again:

• Ordering a non-compliant pump. A COP that is too low, an outdoor unit that is too loud or a 55 °C flow temperature without justification, and the application is refused. Demand the certificate of conformity before signing.
• Forgetting the acceptance inspection. Without proof of the request to the Chambre des Métiers, the file is incomplete.
• Missing the deadlines. Invoice after 31 December 2028 for the bonus, application filed more than 4 years later: the difference runs into thousands of euros.

The remedy is simple: an installer who knows the Klimabonus 2026, a quote that states compliance with the regime in black and white, and an application filed right after the invoice.