How to Choose a Dehumidifier for a Florida Home

If your home in Cape Coral, Fort Myers, or Naples feels sticky even when the AC is running, or you're noticing musty smells, damp closets, or condensation on windows, you've probably wondered whether a dehumidifier would help. Often it can. But the right choice depends on the size of the problem, where it's happening, and whether your air conditioner is doing its part.

This guide walks through how to choose a dehumidifier for a Southwest Florida home, from small portable units to whole-home systems.

First, know your target humidity

For most homes, keeping indoor relative humidity below about 60 percent, and ideally somewhere in the 30 to 50 percent range, helps limit mold and dust mites and makes the house feel more comfortable. In Florida, getting under 50 percent in summer can be hard, and many homeowners are happy staying in the mid-40s to mid-50s.

Before buying anything, pick up an inexpensive digital hygrometer and check a few rooms over several days. That tells you whether you have a whole-house problem or one damp room.

Why Florida homes struggle with humidity

• Outdoor humidity is high most of the year. Every time a door opens, humid air comes in.
• An oversized AC. A system that's too big cools the house quickly and shuts off before removing much moisture. See why bigger isn't better for Florida humidity.
• The fan set to "On." Running the blower continuously can push moisture from the wet coil back into the house between cycles. "Auto" is usually better for humidity.
• Duct leaks. Leaky return ducts in a hot attic can pull in humid air. Our guide on AC duct replacement covers the warning signs.
• Seasonal homes. A closed-up house with the AC set high can get damp quickly.

Not sure whether the problem is your AC or the house? Have a specialist call you.

Portable dehumidifiers

Portable units are the most common choice for one room or one area: a bedroom, a closet, a bathroom without a good exhaust fan, or a laundry room.

How capacity is rated

Portable dehumidifiers are rated in pints of water removed per day. One thing that confuses shoppers: in 2019, the U.S. Department of Energy changed the test conditions used for these ratings. Under the newer test, the same machine gets a lower pint rating than it would have under the old one. So a unit sold today as a "50-pint" model is roughly similar in size to what used to be sold as a "70-pint" model. When comparing, make sure you're comparing ratings under the same standard.

Choosing a size

Manufacturers publish sizing guidance based on square footage and how damp the space is. In Florida, it's common to size up from what a dry climate would need, because the air keeps bringing moisture back in. A unit that's too small runs constantly and still falls behind.

Draining

Most portable units collect water in a bucket. In Florida humidity, a bucket can fill fast. Look for:

• A gravity drain hose connection so it can drain to a floor drain or sink.
• A built-in pump if you need to push water up and out, such as into a sink or out a window.
• Auto shutoff when the bucket is full.

Other features worth having

• A built-in humidistat so it runs only when needed
• Auto restart after a power outage, helpful during storm season
• An easy-to-clean filter
• An ENERGY STAR rating for efficiency
• Reasonable noise levels if it's going in a bedroom

Remember that portable dehumidifiers give off heat while running. In a small closed room, you may notice it.

Whole-home dehumidifiers

If the whole house feels damp, a whole-home dehumidifier is often a better fit than several portable units. These are installed by an HVAC contractor and connected to your ductwork or set up to serve the home's air.

Advantages

• Treat the whole house rather than one room
• Drain directly to a condensate line, so no buckets
• Run quietly, usually in the attic, garage, or air handler closet
• Controlled by a wall control or a compatible thermostat

Things to consider

• Higher upfront cost than portable units, since installation is involved
• Needs space near the air handler and a drain
• Filters need regular changing
• Works best when the AC and ducts are in good shape

Brands like Aprilaire and Santa Fe are common in this category. Your installer can help match the capacity to your home's size and how damp it gets.

When the real fix is the AC

A dehumidifier can be the right answer, but sometimes it's treating a symptom. Consider looking at the AC first if:

• The system short cycles. See our guide on AC short cycling in Florida humidity.
• The house has felt damp since a new AC was installed, which can point to oversizing.
• The system is older and nearing replacement anyway.

If you're replacing the AC, a two-stage or variable-speed system can run longer, lower-speed cycles that remove more moisture. Our guide on how to choose a new AC goes over options. A smart thermostat with humidity features can help too; see smart thermostats for a Florida AC.

Thinking about a whole-home dehumidifier or a new system that handles humidity better? Get a quick call back.

A quick decision guide

• One damp room or closet: a portable dehumidifier with a drain hose and humidistat.
• Several damp rooms or the whole house: a whole-home dehumidifier, after checking the AC and ducts.
• Seasonal home that sits closed up: a whole-home dehumidifier or a well-controlled AC setup, plus remote humidity monitoring.
• Damp since a new AC went in: have the sizing and settings checked first.

FAQ

What's the best dehumidifier for Florida?
There isn't one best model for everyone. For a single room, look for a properly sized ENERGY STAR portable unit with a drain option. For whole-house problems, a whole-home unit installed with your HVAC system is usually more effective.

Can I run a dehumidifier and AC at the same time?
Yes. Many Florida homes do. The AC handles temperature and some moisture, and the dehumidifier handles the rest.

Will a dehumidifier lower my electric bill?
It adds its own energy use, but drier air can feel more comfortable at a slightly higher thermostat setting. Results vary by home.

Where should I put a portable dehumidifier?
In the dampest area, away from walls and furniture so air can flow, with doors and windows closed.

Have questions about humidity in your home? Call or text (239) 946-6132.