The problem is if you have a retrofit to do and don't want to hire a contractor, you are pretty much out of the game to replace fresh air into the bedrooms and exhaust from the kitchen and bathrooms. That ductwork isn't very DIY friendly. The idea is great when you can have it implemented in new construction when its cheap to do and can be designed with a decently appropriate exchange rate. Of course new construction is primetime where you really need to replace the air from all of the contaminants leeching from the construction process and all the moisture involved in those components.
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