FAQ

For the preparation of a LENOZ certificate, you can apply for financial aid (preparation grant) amounting to €1,500 gross per single-family home and €750 gross per flat in a block of flats.

A LENOZ certificate includes an estimate of the sustainability of a residential building, calculated on the basis of six categories: location, society, economy, environment, building and technical installations, and functionality. The certificate includes the sustainability class and the points obtained per category/criterion.

LENOZ is an optional global assessment strategy, adapted to the Luxembourg market, for quantifying the sustainability of housing. LENOZ stands for Lëtzebuerger Nohaltegkeets-Zertifizéierung.

The installation of an electricity meter is compulsory in order to be eligible for State subsidies. This meter must measure the total consumption of the heat pump (including auxiliary consumption, such as for the circulation pump and the heating body).

Using the consumption data, you can also determine whether the installation is working efficiently and, in the event of deficiency, have it examined by a specialist as soon as possible.

Yes, geothermal probes also allow you to use a heat pump to air condition a building. It is even advisable, as the heat extracted from the house can be used to regenerate the ground.

In this context, a distinction must be drawn between active and passive air conditioning. In an active system, the heat pump acts as a cooling unit during the summer by actively reversing the circulation within the pump. In a passive system, on the other hand, the heat exchanger is used to evacuate the heat from the dwelling to the probe circuit. Passive cooling is recommended due to the high electricity consumption of an active system.

It is recommended that the drilling work only be performed by a company with DVGW W 120 certification (ADEME-BRGM-EDF quality commitment approach) or equivalent. If the work is not carried out by a competent company, drilling and probe installation work can lead to serious complications, both during the drilling work itself and during subsequent operation. It is also essential to have a sound knowledge of Luxembourg geology.

Find out about this from the drilling company you have chosen.

No. Boreholes drilled for surface geothermal energy cannot under any circumstances trigger an earthquake. Nor has a geothermal probe ever been observed to have been damaged by an earthquake.

Under the new rules for the installation of geothermal probes, damage can be practically excluded if the rules are carefully observed.

You have the right to consume electricity that you produce yourself, but you must comply with the connection conditions set by the relevant grid operator. In theory, it is technically feasible to supply your heat pump directly with electricity that you generate yourself using an intelligent controller. Ideally, you should ask your installer for advice on this matter.