This work represents the creation and comparison of the energy performance certificate for three storey residential building in two different programes. At first the building itself is introduced with its geographical location, history and architectural characteristics. Next the input data needed for the calculation is introduced. Materials, thermal bridges, heating systems, cooling systems and ventilation are introduced. Then two energy performance certificates are made in two different programes. After that the actual condition is introduced and comparison between the programes is made. The differences between an actual condition and performance certificates are introduced and commented. At the end there are several advices and recommendations for better energy efficiency of the building.
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