If you live in Southwest Florida, you already know the routine. Summer shows up early. The air feels thick. Your shirt sticks to you before you’ve even finished bringing groceries inside. And even when the thermostat says 74°F, the house can still feel “not quite right.”
A new University of Florida report helps explain why. The takeaway is simple but important: heat waves are getting more severe when you factor in humidity, not just temperature.
From our perspective at Air Conditioning Repair Cape Coral, that lines up with what we see in real homes every week. In a climate like ours, comfort is not only about lowering the temperature. It’s about removing moisture at the same time. When humidity climbs, your system has to work harder, longer, and smarter to keep your home feeling comfortable.
Let’s break down what the University of Florida researchers found, why it matters for homeowners in Cape Coral, and what you can do to protect comfort, indoor air quality, and your AC system during our stickiest months.
What UF’s Research Says: Heat Gets More Dangerous When Humidity Is Included
In the UF story, geography professor David Keellings explains that heat waves are often defined by temperature and duration. That’s the traditional method.
But UF’s team developed a broader way to measure heat waves called the Heat Severity and Coverage Index (HSCI). Instead of only asking “How hot was it?” They also consider how long the heat lasted and how widespread it was geographically.
Then they did something especially relevant for Florida. They added humidity into the mix.
When they included humidity, the researchers saw a “much bigger and sharper increase” in heat severity in the eastern U.S., including Florida. The reason is straightforward: humidity makes it harder for the body to cool itself, because sweat doesn’t evaporate as efficiently.
This matches how the National Weather Service explains the heat index (also called “apparent temperature”). When humidity is high, sweat can’t evaporate well, so the body loses one of its main cooling tools.
What This Means for Your Home: “Cool” Isn’t Always Comfortable
Here’s the part homeowners often find confusing:
- You set the thermostat low.
- The system runs.
- The house temperature drops.
- But the home still feels sticky, heavy, or clammy.
That’s usually a humidity problem, not a temperature problem.
In HVAC terms, we’re dealing with two types of load:
- Sensible load: lowering the air temperature
- Latent load: removing moisture from the air
In Cape Coral, latent load can be the bigger battle, especially during long stretches of humid weather and warm nights. UF’s research reinforces why that matters. If humidity is intensifying heat exposure outdoors, it also helps explain why indoor comfort can feel “off” unless the home is properly dehumidified.
The Comfort Target Most People Miss: Indoor Humidity Matters
A practical benchmark that we like because it’s easy to measure is your indoor relative humidity (RH).
U.S. Environmental Protection Agency recommends keeping indoor humidity between 30% and 50%. That range helps with comfort and can reduce the likelihood of moisture-related issues like mold.
In our climate, many homes drift into the 55% to 65% range (or higher) without the homeowner realizing it, especially if the system is not removing moisture efficiently.
A basic hygrometer (humidity gauge) is inexpensive and tells you a lot fast. It’s one of the easiest “home diagnostic” tools you can buy.
The Big Picture: Florida’s “Sticky Heat” Is Not Going Away
UF’s researchers say Florida stands out as a place where heat waves are becoming more frequent, higher in magnitude, and longer lasting, with more passages of warm, humid air masses than in the past.
For homeowners in Cape Coral, that means comfort problems will increasingly be humidity problems.
The best approach is proactive:
- Monitor indoor humidity
- Keep your system maintained and draining properly
- Reduce humid air infiltration where you can
- Address performance issues early, before the hottest stretch of the season
If you’re in the area, and you need help lowering your indoor humidity, reach out today!
