A Florida home closed up with the AC off or set high is a mold incubator with a street address. Outdoor dew points sit in the 70s for months; indoor surfaces cool at night; moisture condenses in closets, on leather and wood, and inside wall cavities, and growth starts on dust and drywall paper within weeks. The discovery is usually made by a neighbor, a home watch service, or an owner returning to a smell that hits at the door.
Whittier's closed-up pattern is the probate and rental version rather than the snowbird one: houses shut between occupants, estate properties waiting on paperwork, and rentals between tenants, in a climate mild enough that nobody expects growth and steady enough that a small leak feeds it for months. The re-entry walk runs the water, opens under every sink, and reads the bathrooms by smell before the cleaning crew is booked, because cleaning a closed-up house before its moisture story is known just hides the evidence.
The prevention is boring and effective: keep the AC running with humidity control as the goal (a humidistat or a smart thermostat holding indoor humidity under about 60 percent), keep interior doors and closet doors open for airflow, and have a human being walk the home on a schedule with instructions to run water, check the handler pan, and look under sinks.
If you are opening a home that sat closed through a Florida summer, ventilate first, photograph what you find before wiping anything, and get the moisture inspection before the cleaning crew. Cleaning visible growth while the humidity source still runs is mopping with the tap open.
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