Heat Exchanger
Fresh air without the energy loss.
BY CHARLES PLATT 
Photography by Garry McLeod; illustrations by Charles Platt
An ideally energy-efficient house should be tightly sealed, to hold cool air inside during the summer and keep it out during the winter. The trouble is, we need to circulate some fresh air to remove odors, bring in oxygen, and reduce the risk of mildew and mold growth.
Is there a way to move air in and out of a house while minimizing the heat moving in and out?
One simple gadget can do it: a heat exchanger, aka “heat ...
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