Have no need to calculate what good passive solar design can do as existing cabin warms to 50/60 degrees on sunny days even on subzero days with no other heat source with older standard double glazed windows. The challenge is to store and minimize loss of that gained FREE heat cost effectively as simple tech as possible. Well designed window can be helpful with that if glazed right. Related item that I haven't found much info on is super high R exterior doors.
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