The impact of the energy performance regulations' updated on the construction technology, economics and energy aspects of new residential buildings: The case of Greece

The implementation of the REPB significantly reduced the required heating loads for space heating in all climate zones by 37%-48% for both building types; this is mainly attributed to the improvement of the thermal properties of the building envelope and the improved energy performance of the electromechanical systems. The required cooling load was low and the implementation of the REPB did not change it significantly. Significant energy savings, in the range of 51%-58% were also achieved by installing flat plate solar collectors for Domestic Hot Water heating.