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Having just built an addition which needed its own HVAC system, I was surprised to find the cost of an American Standard ERV to be several thousand dollars, prohibitively expensive for us given all the other costs. :/

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Most of the cost is install. A basement glass block window with a dryer vent (under $100 for a pro to install around me) makes self installing easy and professional a few hours of labor.

I've seen new ERV units under $1,000 and some pop up used on Ebay for great prices.

Not sure the size of your addition, but Panasonic makes a small ERV for around $400, I use it in my 500sf workshop. They have a larger model that is around $1000.

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