Display® mostly uses data based on the GEMIS software managed by the German Öko-Instutut, but provided by different sources such as the Institute for Housing and Environment (IWU) Darmstadt, Germany or the database ProBas which is run by the German Umweltbundesamt. Furthermore, data coming from the International Energy Agency (IEA) is applied for the national energy mix. The classification scheme for most building types leans on the Danish classification scheme for the respective building types. For detailed information on the data sources used, please have a closer look at the online wiki users’ guide.