In summer, vents let warm humid air in. The relative humidity of the cool air in the crawlspace went way up.
Air in a crawlspace is naturally cool because it’s shaded from solar radiation and in direct contact with the earth.
In the summer, when the crawlspace vents and other openings let warm humid air in, the crawlspace cools it.
As the air cools, it cannot hold as much moisture as before, so its relative humidity rises dramatically.
When the cooling air has more moisture than it can hold, where is that moisture going to go?
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