How to Control Indoor Humidity During a Florida Summer

In Daytona Beach, average relative humidity from June through September regularly exceeds 75% — and that's just outdoors. Indoors, without active moisture control, humidity can climb even higher as cooking, showering, and even breathing add moisture to the air. The key number to remember is 60%: mold begins to grow when indoor relative humidity stays above 60% for more than 24–48 hours.

Here's how to keep your home below that threshold all summer.

1. Let Your Air Conditioner Do Its Job

Your AC doesn't just cool air — it removes moisture. But it only dehumidifies while it's running. Many Floridians turn the AC up to 85°F when they leave for work, which lets indoor humidity spike. Instead:

• Set your thermostat to 78°F when you're home and no higher than 82°F when you're away.
• Make sure your AC unit is properly sized. An oversized unit short-cycles (cools too fast and shuts off), removing less moisture than a correctly sized one.
• Change your filter monthly during summer. A clogged filter reduces airflow and dehumidification capacity.

2. Add a Whole-Home or Portable Dehumidifier

If your AC can't keep humidity below 60%, a dehumidifier is the next line of defense:

• Whole-home dehumidifiers integrate with your HVAC system and handle the entire house — ideal for larger Daytona Beach homes.
• Portable dehumidifiers work well for single problem rooms. Size the unit to the room's square footage and empty the reservoir regularly (or set up continuous drainage).

3. Ventilate Moisture at the Source

• Run bathroom exhaust fans for 30 minutes after every shower.
• Use a range hood that vents outside when cooking.
• Make sure your dryer vents to the exterior, not the attic or garage.

4. Seal and Insulate

• Seal air leaks around windows, doors, and penetrations with caulk or weatherstripping. Humid outdoor air enters through gaps and condenses on cool interior surfaces.
• Insulate cold water pipes to prevent condensation drips that feed hidden mold.
• Consider a vapor barrier in your crawl space to block ground moisture.

5. Monitor with a Hygrometer

A hygrometer ($10–$20 at any hardware store) measures indoor humidity. Place one on each level of your home and check it daily during summer. If readings consistently exceed 60%, increase ventilation or dehumidification in that area.

Signs Your Humidity Is Too High

• Foggy windows or mirrors that stay clouded
• A persistent musty smell
• Warped wood or peeling paint
• Damp-feeling air or clammy surfaces

If you're seeing these signs, mold may already be growing in hidden areas. A professional moisture and mold inspection can pinpoint the source. Call (844) 393-2902 for a free assessment anywhere in Volusia or Flagler County.