Should the Air Vents to the Crawl Space Be Open in the Winter?


Reduces Moisture Buildup Year-Round

  • Crawl space vents exist to reduce the humidity in the bottom floor, according to home builder Tim Carter. You should not close them at any time during the year--winter included--because torrential rain can strike any time.

Close on Cold Days

  • You can close crawl space vents for a few days during really cold winter spells, according to the Discovery Channel. To prevent moisture from causing damage--as it can in a relatively short period of time--consider putting a vapor barrier on the floor, such as a sheet of plastic or foil.

Bottom Line

  • You do not want to close off crawl space vents because they remove moisture from your basement, according to the Discovery Channel. You can, however, safely close your vents temporarily if you put a vapor barrier on the floor or use a premium vapor retarder.

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  • Photo Credit rusted vent image by Karin Lau from
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