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In last two decades, sustainability is one of the most important subject in our society. Retrofitting and reduction of CO? emisions from residential buildings is becoming an anchor of interactive approch to global, environmental and socio-economic policy. There are several measures taken to increase the energy efficiency, both for new buildings and for existing buildings, such us the 20 –20 –20 EU Policy andthe Nearly Zero Energy Buildings goal set bythe Energy Performance of Buildings Directive 2010/31/EC, which ...