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- The world’s first Passive House, Darmstadt-Kranichstein, Germany
- efined as buildings which have an extremely small heating energy demand even in the Central European climate and therefore need no active heating. Such houses can be kept warm "passively", solely... ering through the windows as well as by a minimal heating of incoming fresh air((We show at another place that this is possible if the maxial heating load is kept below 1o W/m²(useful area) in a resi