I saw some HRV units on Ebay in the $450 range. Looked up the maker and found this
site:
HRV Airiva Heat Recovery Ventilator with a video..
http://www.suncourt.com/Flash/Suncourt%20Video.swf
Here's an installed review..
Amazon.com: Suncourt AIRIVA HE150 Heat Recovery Ventilation System: Everything Else
I've been thinking about air quality a lot lately. My wife has been experiencing
a hacking cough for years and it seems to be getting worse.
Doctors don't have a clue, so I'm wondering if it's airborne irritants.?.
Besides, I kinda like the idea of getting some fresh air during the winter,
when everything is shut up tight.