What are the Recommended Relative Humidity (RH) Levels for my Basement and Crawlspace?

Studies have shown that as much as 50% of the air in a home comes up from the basement or crawlspace.  This air is often higher in moisture content, and carries with it various allergens and musty odors. The Environmental Protection Agency, American Lung Association, and American Medical Association all recommend maintaining RH in the 30% – 50% range.

When conditions linger above 60% RH for extended periods of time; mold, mildew, and bacteria grow.


A commercial grade Santa Fe high efficiency dehumidifier is designed to consistently maintain 50% or less RH in crawlspaces and basements.

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