Periodic Reporting for period 2 - HAPPENING (HeAt PumPs in existing multi-family buildings for achieving union's ENergy and envIromeNtal Goals)

Currently, buildings are responsible for 40 % of the energy demand and 36% of the CO2 emissions in Europe. Decarbonisation of existing buildings plays a key role in order to reach the overall climate protection targets. However, current renovation rates lie in the order of...