Other Ways to Provide Ventilation Air in Tight Homes

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One of our local contractors who builds energy efficient homes just uses small pop-open fresh air vents in most rooms.  These provide a little fresh air ventilation but do not recover any heat from the outgoing air.  So, I guess you could say that his solution is to deliver the minimum required amount of fresh air to the areas its actually needed, and the energy cost to heat this air will be small.  This must work to some degree as his homes are very energy efficient.