The exhaust air in a counter-flow heat exchanger heats supply air. It provides approximately 80 per cent heat recovery. During the summer, the heat exchanger can be turned off (automatic bypass) and the house may be ventilated without preheating of the supply air and by opening windows.

Living in these houses requires no more effort or knowledge than to live in conventional housing. If it is cold outside, the occupants do not open the windows. If it is warm and sunny, they do. If it is too warm, they open windows on both sides of the house and the roof to create a through draft, and lower the blinds or the awnings outside the south-facing windows.

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