Last week, the 15th International Ruhr Energy Conference 2026 (INREC) took place at the University of Duisburg-Essen. In the session ‘Energy Policy, Buildings and Behaviour’, Lisa Sieger (UDE) presented a study on quantifying the so-called energy performance gap in residential buildings, which was carried out as part of the KliWinBa project. Specifically, the study examines the differences in the assessment of residential buildings’ energy efficiency based on energy consumption and demand certificates. The findings met with keen interest from the specialist community and provided important impetus for further discussion regarding the validity and application of the various types of certificates.
The study will be published soon.