The UF/IFAS guidance behind that local audit sets the safe maximum at 55 percent indoor relative humidity, with mold growth accelerating above 60 percent. A Sarasota home living in the high 60s or low 70s is growing mold on schedule without any leak: drywall paper, closet contents, and the backs of furniture against exterior walls are the first surfaces. The fixes are mechanical before they are chemical: an AC system that runs long enough to dehumidify rather than short cycling, a dedicated dehumidifier or humidistat control where the system cannot hold the line, and condensate drainage that actually drains. Measure with a simple hygrometer in the worst room, not the hallway by the thermostat; the worst room is the honest number.
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