Should I put an A/C return in my encapsulated crawl that has a bit of a smell currently?
I am having a new HVAC pancake system (Trane XR17 and sdv9 furnace) installed in my crawlspace this week. The installers have removed a lot of existing ductwork and I can smell the crawlspace in the house above right now, since the air just flows up. At one point I had considered installing a return in the crawlspace along with the supply registers to help keep the area dry without a dehumidifier that I use right now, and also to take advantage of the “free” cooler air in the crawl in the summer months, but the current smell is putting me off. The humidity is only around 50-55% down there now, and has been like that for weeks since we encapsulated. It is a musty smell, nothing else. Should I go ahead and put in a return and figure that with the new airflow and a Merv11 filter on the unit that I would quickly get rid of the smell, or is it likely to linger? I like the idea of treating the encapsulated crawl like I would any basement in another home, but it the smell is not likely to go away I wouldnt want to do that. Thoughts?
The encapsulation by the way is with a 12 mil poly on the ground and 1.5 in of closed cell on the walls and 3″ of open cell in the rim joist.
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