Glossary
Relative humidity (RH)
Relative humidity is the share of moisture the air holds compared with the most it could hold at that temperature. EPA says keeping indoor humidity below 60%, ideally 30% to 50%, helps limit mold.
Why it matters in a South Florida home
Agency guidance points to the same range. EPA says to keep indoor humidity below 60% relative humidity, ideally between 30% and 50%, and notes that a moisture or humidity meter costs about $10 to $50.
Florida DOH says to keep humidity below 60%, with below 50% best because it also controls dust mites.
Agency targets
EPA
Below 60% relative humidity, ideally between 30% and 50%.
Florida DOH
Below 60%, with below 50% best because it also controls dust mites.
Measuring it
A moisture or humidity meter costs about $10 to $50.
Related terms
Used on these pages
Sources
- U.S. EPA Brief guide mold moisture and your homeAccessed 2026-09-26
- Florida Department of Health MoldAccessed 2026-09-26