FAQ

The energy performance certificate is a regulatory obligation, therefore no subsidy is provided for its establishment.
The energy performance certificate is issued according to precise rules set out in the amended Grand Ducal Regulation of 30 November 2007 on the energy performance of residential buildings. It is valid for 10 years from the day of its issue. The issuance of an energy performance certificate and the information it contains shall not result in any direct obligation for energy retrofitting.

The energy performance certificate (EPC) or energy passport is the quality label that defines the energy performance of a residential building. The certificate provides information on the energy efficiency of residential buildings and thus allows comparisons to be made with other residential buildings. Thus, even without technical knowledge, the consumer can assess the energy quality of a residential building.

The obligated parties have a certain degree of freedom in their choice of energy efficiency measures. In order to guide their services, they can achieve energy savings either through standardised measures or specific measures. The standardised measures set out different example cases and set flat-rate energy saving values for the following families of measures:

•  Thermal envelope of buildings (walls, windows, roofs, slabs)
• Heat production
• Mechanical ventilation
• Household appliances
• Office equipment
• Lighting
• Transversal industrial techniques (motors, pumps, ventilation, compressed air, boilers, refrigeration)
• Management energy
• Transport (replacement of cars).

Energy efficiency measures not included in the catalogue of measures are to be considered as specific measures, which cannot be accounted for by the obligated parties in case of certain calculation principles and if no standardised measures are applicable.

The implementation of this obligation mechanism was born out of the desire to achieve the objectives set out in the national energy policy on energy efficiency more effectively.

This measure allows the obligated parties to seize the opportunity to expand their business models and offer energy services to consumers. The experiences of other EU Member States that have already implemented such a mechanism have shown that this approach, based on sound regulation, makes possible the subsequent deployment of energy efficiency measures.

No, LENOZ is an optional certificate that provides information to the main contractor and the owner about the level of sustainability of a residential building.

The following persons are authorised to issue LENOZ certificates:

• architects and engineers within the meaning of the Law of 13 December 1989 organising the professions of architect and consulting engineer;
• accredited persons within the meaning of the Law of 5 August 1993 on the rational use of energy;

• energy consultants within the meaning of the Act of 21 April 1993 on the approval of natural persons or legal entities, private or public, other than the State, for the performance of technical study and verification tasks in the environmental field.

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.

The operator of a facility – in this case, you as an individual – is liable for the construction and operation of the facility in compliance with the applicable provisions and for all damages that may result therefrom. You should therefore check carefully that the drilling documents are complete. These should include:

the completed pressure test form as proof of the tightness of the geothermal probe once the probe has been placed (ask the drilling company if this report complies with VDI Guideline 4640);
the complete drilling report.

No. The Law of 19 December 2008 on water prohibits the direct or indirect discharge of water as well as other solid or gaseous substances. Groundwater heat pumps cannot therefore be authorised in Luxembourg.