Asset rating: Disagreement between the results obtained from software for energy certification.

The general practice for establishing the consumptionin asset ratings of a building consists of entrustingthe energy analysis of the shell of a building tocalculating software.The building is the subject of an extremelycomplicated analysis, and there are many variables atstake, is it more correct to aim for a simplification ofthe problem, in the knowledge that behind everyanalytical formula there is the possibility of anevaluation error, or is it better to aim for calculationmodels that are more and more detailed in an attemptto succeed in predicting the real energy behaviour ofthe building ?Depending on the objective that has been set, it is agood idea to identify the tool best adapted to reachingit: it is not correct to use simplified calculationmethods for every analysis, but not correct to applydynamic simulation models unconditionally either.This article shows the different predictive results ofenergy performance implemented on a samplebuilding and obtained using different software andmethods of calculation.