GEAK (Gebäudeenergieausweis der Kantone)
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The Gebäudeenergieausweis der Kantone (GEAK), Switzerland's cantonal building energy certificate, classifies buildings into energy classes from A (very efficient) to G (inefficient) and gives recommendations for improvement. Many cantonal funding programs require a GEAK as proof before granting a contribution toward a heating replacement.
The GEAK is issued by licensed GEAK experts, and you can search for a certified professional on the website. The cost of a standard GEAK runs to a few hundred francs depending on building size, though this too can be subsidized through cantonal programs.