One in Three

Luxembourg wants households to switch from fossil-fuel boilers to heat pumps. Nearly 85% of homes still run on fossil fuels for heating, and the International Energy Agency has flagged the buildings sector as lagging on emissions cuts. So the government is reinstating the Klimabonus Wunnen subsidy scheme, adding a temporary €2,000 top-up for geothermal and air-to-water heat pumps in existing homes, and introducing pre-financing so contractors can deduct the grant directly from the customer's bill.[1]

Here is the catch. Since last August, when temporary inspection rules came into force, one third of the heat pumps checked by the Environment Agency were not compliant.[2]

One in three. That is not a rounding error. That is a systemic problem.

The failures were not subtle. Systems too large for the property. Heat pumps installed in the wrong place. Units configured incorrectly. Households who bought in good faith, received a subsidy, and then discovered the equipment did not perform as promised. The environment minister put it plainly: "In that case, we risk losing some of our citizens on the road to the ecological transition."[3]

So now the government is doing two things at once. It is throwing more money at the problem, with retroactive grants from January 2026, temporary top-ups through June 2027, and the wider programme running through 2030. And it is tightening the screws, replacing the temporary inspection regime with a permanent legal framework that requires post-installation checks and regular inspections throughout the heat pump's working life.

The pre-financing measure is the interesting one. Starting January 2027, contractors can deduct the expected grant directly from the bill and recover the money from the government. The household pays less upfront. The IEA identified the cost gap between heat pumps and fossil-fuel boilers as the main obstacle to adoption, so reducing the out-of-pocket amount matters. But pre-financing also means the government is paying for installations that, one time in three, may turn out to be non-compliant when inspected afterward.

The tension is obvious. You want to move fast because 85% fossil-fuel dependence is unsustainable. But moving fast with public money and getting it wrong one-third of the time is how you erode trust in the entire transition. People who hear "heat pump" and think "my neighbour got one and it does not work properly" are not going to call a contractor, no matter how big the subsidy.

The permanent inspection regime is the right call. Subsidies without quality control are just procurement theatre. But the government should have led with inspections, not added them after the fact. The temporary rules only arrived in August 2025, presumably after enough bad installations had already happened to make the problem impossible to ignore.

Still, the direction is correct. More money, less upfront cost, real oversight. If the one-in-three failure rate drops sharply under the permanent regime, the programme will have been worth the awkward start. If it does not, the government will be paying for a transition that is not actually transitioning.