Ecological home for cold areas
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Why not build a house that uses ground and snow as isolation?
The house could have 3 sloped sides going to ground level and there if it is helpful could be roof covered air pockets between underground wall and ground. One side would be mostly glass. During winter the snow would help insulate most of the building (as there are no walls except the glass wall letting light and warmth in). Rainwater could be collected and used (by dehydration) in summer to cool the building. Air would need to be circulated from high point of the building to low point of the building. The roof could be "ground" roof.