Is mold worse in Florida?

What makes Florida different

Mold needs moisture, a food source and a comfortable temperature. Drywall paper, wood, dust and fabric supply the food in every house in the country, so the real difference between regions is moisture and warmth. Southwest Florida has plenty of both, for most of the year.

The National Weather Service puts Southwest Florida’s rainy season at May 15 to October 15, a little longer than the rest of West Central Florida, and forecasters watch for dew points that stay above 70°F as a sign it has started. Air that wet finds every cool surface in a house: the supply vent, the back of a closet on an exterior wall, the AC closet, the space under the kitchen sink. The Florida Solar Energy Center notes that long stretches of indoor relative humidity above about 70 to 75 percent create conditions that favor mold growth.

It isn’t a different mold, it’s more opportunity

People sometimes assume Florida has a special, more dangerous mold. In practice, the molds found in Florida homes are largely the same kinds found indoors across the country. What changes is how often a house gives them the water they need, and how quickly a small problem becomes a large one. A slow drip under a vanity in a heated Midwest home in January might take a while to show. The same drip in a closed-up Cape Coral house in August has heat and humid air working for it from day one.

Some of those molds, including water-loving types that grow on wet drywall, can produce mycotoxins. Our page on whether black mold is common in Florida covers that question in more detail.

Where mold shows up in Southwest Florida homes

Most homes here sit on a slab with no basement or crawl space, so the trouble spots are different from what you’d read about in northern guides.

• The AC closet and air handler. The system pulls water out of the air all day. A clogged condensate line or a dirty drain pan puts that water right back into the house.
• Concrete block walls. Block absorbs rain and releases it slowly, so the drywall fastened over it can stay damp after the room looks dry.
• Closets on exterior walls. Dark, rarely opened and often cooler than the rest of the house.
• Under sinks and behind appliances. Small plumbing leaks go unnoticed for weeks.
• Seasonal homes. A house closed up for the summer with the AC set too high, or switched off, can grow mold on furniture, shoes and walls without anyone seeing it.

Storms raise the stakes

Hurricane Ian in 2022 and Helene and Milton in 2024 left many Southwest Florida homes wet at the same time, often with the power out for days. Without air conditioning, indoor humidity climbs quickly, and the EPA’s guidance is that water-damaged materials should be dried within 24 to 48 hours to prevent mold growth in most cases. After a big storm, crews and equipment are stretched thin, and homes wait. That wait is a large part of why storm-related mold is so common here.

What this means for your home

Florida’s climate isn’t something you can change, but indoor moisture is. The habits that matter most here:

1. Keep indoor humidity below 60 percent, as the Florida Department of Health recommends. Lower is better for mold.
2. Keep the AC running and maintained, including the condensate line and drain pan.
3. Fix leaks right away and dry anything wet within a day or two.
4. Don’t turn the AC off when you leave for the season.
5. Pay attention to a musty smell. It often shows up before visible growth.

For the full picture of how humidity drives mold here, read our guide to Florida humidity and mold. If you already see growth or smell it, our Florida mold remediation page explains how we remove it. In Florida, an independent licensed mold assessor inspects and samples the home, writes the scope and performs clearance testing, and we do the remediation to that protocol.

We remove mold and mycotoxins from buildings. We don’t diagnose or treat medical conditions. If you have symptoms, please work with a doctor. With your permission, we’re glad to share test results and our plan with them.