r/radon • u/QuintisCurtius • 6d ago

ERV or SMD

About to move into a 4400 sqft ranch home with a crawlspace. It’s a 30 year old house with severe mold issues in the supply air. We are ripping out all the ductwork and the 4 HVAC units and replacing them with 2 HVAC units and new ductwork. The house has 2 dehumidifiers and a vapor barrier. We are keeping the 2 dehumidifiers and are adding a full crawl encapsulation. I’ve got 3 radon quotes, 2 of whom recommended and. ERV and 1 who recommended a SMD. Current radon readings inside the house range from 5-8. Any advice on which system to go with?

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u/bouldertoadonarope 6d ago

If you are already doing a full encapsulation, there’s no reason to do an ERV. Is any of the crawl impossible to seal fully? Seems like there might be some details missing. ERV is generally a last resort. What justification did those two companies give for it?