Abstract
Regarding energy performance assessment of existing building, the European Standards EN ISO 13790 and EN 15316, adopted at national level in Italy by Technical Standards UNI/TS 11300 (part 1 and 2), allow different approaches and simplification levels for defining some representative input parameters determining uncertainties in the results. Therefore, the reliability of calculated energy performance could be affected. The analysis has been supported applying a set of refurbishment actions on some representative cases of common national residential building stock, comparing the energy performance obtained with different calculation methods allowed by National Technical Standards and laws. The results show how these differences can lead to uncertainties about the class definition.
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