A musty smell in house air means hidden damp and usually mold, and your nose catches it before your eye does. Where to look for the source, why air fresheners only mask it, and how to clear it for good.
Seven signs your home is too humid: condensation on windows, a musty smell, mold spots, peeling paint, warped doors, stains, and clammy air. What each one points to, and how to bring humidity back into the healthy range.
The ideal home humidity is 30–50% relative humidity, per the EPA: below it the air is too dry, above 60% mold grows. What happens at each level, the one number to aim for, and why holding it takes real work in Florida.