Softwares Energy Certification
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Calener GT
It is actually an energy simulation software. Much more precise than explained above. Uses DOE-2 calculation engine.
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Calener VYP
This is the official software for energy certification of buildings. It takes advantage of the calculations made in the Lider (HE-1). It is more precise than the simplified methods (CE3 and CE3x).
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CE-3 and CE3x
Both CE3 and CE3x are the official software for energy certification of existing buildings. These are simplified software programs that use the Calener calculation engine.