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This former detached house dating from the 1960s was converted into two semi-detached residences and renovated to become energy efficient. Despite a higher number of consumers and a larger energy reference area, the building’s energy requirements were reduced by 61%. In addition, thanks to the PV installations installed on the south side of the roof by Ackermann AG, it was possible to build an EnergyPlus construction at a low cost. The project was awarded the HEV Special Solar Prize in 2019.