Residential air-air vent heat exchanger source? [RE-wrenches]

[Steve Willey]

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A customer I once had lived in a ranch house with many layered windows, sealed so tight cit was hard to open the front door for the suction. Some 5 or more layers in each window. Our largest early PV pioneer system in Zilla Washington about 1982. 

He also had an air to air heat exchanger for whole house venting that captured most of the exiting heat and pre-warmed the incoming air.  A lot of zig-zag sheet metal in a small package.  Searching for such a product now, all I see in heat exchangers are water to water and water to air.  Is there anything still made that captures heat in a building to outdoor air exchange system? 
Steve Willey, Backwoods Solar, retired
swilley at pwi.net
phone (208) 263-4788 



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