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- Passive House Institute
- e Passive House Institute (PHI) is an independent research institute directed by Dr. Wolfgang Feist.\\ The... tions to come.\\ This drive has motivated PHI’s research in the field of energy efficient construction, fo... enburg in 2003.\\ As a matter of principle, all research conducted by the Institute is transparent. PHI in... House standard * Scientific coordination of the research group on cost efficient passive houses since 1996