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You crack the door in August and the house smells like a closed cooler. Clothes in the closet have a story. That is not always mold. It is often six or eight weeks of Florida air with nobody there to notice 62% relative humidity (RH).
A month up north, a two-week trip, a seasonal lockup — same lesson: a closed house is still a wet climate. The AC may have been left at 78°F. The fan may have been ON. The garage door may have leaked. Nobody was home to empty a bucket.
What to do the day you get back
Do not start with bleach. Start with numbers.
- Hygrometer in the living room and one in a closet. Hygrometer guide.
- If a wall looks stained or the closet smells like wet paper, pin drywall against a known-dry interior closet. Moisture meter.
- Open the garage as its own zone. Garage.
If living space is above 60% relative humidity (RH), dry the air before you argue with the thermostat. Keep a closed Florida house dry.
What to set before you leave next time
Leave a logger, not a hope. USA-made loggers you can read from up north beat a $12 display you find dead in a drawer.
Set a dehumidifier on continuous drain — never a bucket in an empty house. Size it as if a rain band will happen while you are gone, because it will. Pint chart. After-storm sizing.
Keep the AC in AUTO at a reasonable setpoint. Fan ON recirculates wet coil air. See AC vs dehumidifier.
What not to do at the door
- Do not run every ceiling fan and call it dry-out.
- Do not close the house up tighter without a drain path.
- Do not wait for visible growth. If a wall is wet, call local restoration.
The smell is a sensor. Treat it like one.
Reed Lang writes these notes from coastal Florida. Empty houses still sit in the peninsula. Measure before you drive to the airport, not after you smell the closet.