REGIONAL IMPACT ASSESSMENT OF RETROFIT AND ENERGY EFFICIENCY MEASURES ON RESIDENTIAL BUILDING STOCK ENERGY CONSUMPTION

In the EU, buildings account for a considerable proportion of the total final energy consumption, approximately 40%. The Portuguese residential building stock is old and has a poor energy performance. In this paper, the potential impact of large-scale buildings retrofit and energy efficiency measures' implementation on the whole Portuguese residential building stock is assessed. This analysis is developed through a bottom-up building typology approach, focusing on the space heating and cooling (H&C) energy consumption, for the 25 NUT3 regions of the country. The impact is also assessed from the standpoint of the energy performance gap. Results show that the bundle of fabric retrofit and HVAC systems replacement measures, based on the current regulations' requirements for new buildings, can result in space H&C energy consumption reductions up to respectively 88.9% and 68.6%. Decreases in the H&C energy performance gap are less subtantial, respectively 35.3% and 21.8%. Results confirm the considerable potential of the residential building stock retrofit and energy efficiency (EE) increase as a pathway to achieve the climate and energy binding goals, reducing energy poverty and consequently its side effects on the population's health. The outcomes provide regional insights for the design of more targeted and tailormade deep retrofitting schemes.