hmm.. you could use solar energy to heat the air coming through, otherwise the building would cool down right?
Also is it possible to let the air pass through into one direction only? I think strategically placing incoming/outgoing air-pass through windows, could make a decent air-flow (+heating) system.
Also is it possible to let the air pass through into one direction only? I think strategically placing incoming/outgoing air-pass through windows, could make a decent air-flow (+heating) system.