Energy Efficiency - Technical Information

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This page contains technical information relating to the following Grand Ducal Regulations:

Buildings (RGD 2021)

RGD 2021, which consists of three technical annexes, concerns the energy performance of residential buildings (Annex I) and functional buildings (Annex II). Annex III deals with these two types of buildings.

Climate data for Luxembourg (Thermal protection in summer)

For a building, compliance with the minimum requirements for summer thermal protection may be demonstrated using a simulation (see Annex I, Chapter 1.2 and Annex II, Chapter 1.2). For this purpose, the following climate data shall be used:

Answers to frequently asked questions

Answers to frequently asked questions about the RGD 2021 are published as FAQs (Frequently Asked Questions).

Software

Issuing energy performance certificates

Various software packages are available for issuing energy performance certificates (EPCs) according to the RGD 2021. For residential buildings these are the LuxEeB-Tool and Lesosai. The LuxEeB-F (IBP) software is used to assess the energy behaviour of functional buildings. The LuxEeB-Tool software can be downloaded free of charge, while the Lesosai and LuxEeB-F (IBP) can be purchased from the respective external supplier by following the links below. For each software, a customised licence is required to issue the EPC. Such a licence can be requested from the respective software supplier by any authorised expert according to the RGD 2021. The licence file contains its unique expert number which will appear on any EPC issued with the respective software. We recommend that the software is updated regularly to take account of any regulatory changes.

Residential buildings

  • Software LuxEeB-Tool: licence conditions (external site in German), manual (in French (Pdf, 2.14 Mb) (Pdf, 2.14 Mb), in German (Pdf, 2.09 Mb) (Pdf, 2.09 Mb)). By downloading the LuxEeB-Tool software (external site) you accept the licence conditions. The LuxEeB-Tool software can be used in demo mode with the demo password. The licence application can be made from the software by any expert that is authorised in accordance with RGD 2021. Updates can be made using the software's internal function provided for this purpose or by reinstalling the software. Licences remain valid during an update.
  • Lesosai software (external site)

Functional buildings

Conducting the feasibility study

The EcoCheck-Tool software can be used to conduct the feasibility study provided for in Article 7 of the RGD 2021. By downloading the EcoCheck-Tool software (external website), you agree to the licence conditions (external website, in German).  

Obligations mechanism (RGD 2015)

Answers to frequently asked questions about the RGD 2015 are published as FAQs (Frequently Asked Questions).