As South Florida’s temperatures start to go up and we head towards summer, many homeowners turn down their thermostats to keep the home cool. But even when the inside temperature feels “just right,” that sticky, muggy feeling inside your home can make it uncomfortable, and it’s not your imagination!

At All Star Plumbing and Air, we often get calls this time of year from homeowners asking, “Why does my house feel humid even though my AC is running?” Let’s break down what’s happening, and how to fix it.

What Causes Indoor Humidity in Florida Homes?

Humidity refers to the amount of moisture in the air. In South Florida, that moisture level is naturally high almost year-round. Your air conditioner plays a major role in removing humidity as it cools your home, but when something’s off, moisture can build up fast.

Sewer Camera Inspection.

Here are the most common reasons your home feels humid:

  1. Your AC is Oversized or Short-Cycling
    A system that’s too large cools your home too quickly, turning off before it has time to properly remove humidity from the air. That leaves your home cool but clammy.
  2. Your AC Isn’t Running Often Enough
    In cooler months, your AC may not run as frequently, which means it isn’t dehumidifying as much. Moisture can sneak in from outdoors or through ductwork.
  3. Dirty Coils or Clogged Air Filters
    When coils or filters are blocked, your system can’t circulate air efficiently. This restricts dehumidification and traps moist air indoors.
  4. Leaky Ductwork or Poor Insulation
    In older Florida homes especially, humid outdoor air can enter through duct leaks, attic spaces, or poorly sealed windows and doors.
  5. Fan Set to “ON” Instead of “AUTO”
    When your thermostat fan is set to “ON,” it continuously blows air through the system, even when the AC isn’t actively cooling. This can cause the evaporated moisture on coils to blow right back into your home.

Why Humidity Control Matters

Excess humidity isn’t just uncomfortable, it can affect your health, home, and energy bills. Too much moisture indoors can cause:

Section of sewer pipe clogged with tree roots removed from sewer line.
  • Musty odors and mildew buildup
  • Mold growth on walls, furniture, and vents
  • Allergies and respiratory irritation
  • Damage to wood floors, cabinets, and paint
  • That dreaded “sticky” feeling, even when the thermostat reads 75°F

How to Fix Indoor Humidity Problems

If your home feels damp or sticky, here are a few steps to take:

Full sewer line replacement after sewer camera inspection.
  • Check your thermostat settings – Make sure the fan is set to “AUTO,” not “ON.”
  • Replace your air filter – A clean filter allows proper airflow for dehumidification.
  • Schedule a professional AC maintenance visit – Our team at All Star Plumbing and Air will inspect your coils, refrigerant levels, blower speeds, and ductwork for leaks.
  • Consider a whole-home dehumidifier – For stubborn humidity, we can integrate a dehumidifier into your system for precise comfort control year-round.
  • Seal leaks and improve insulation – Keep humid outdoor air where it belongs, outside!

Have additional questions? Always call the All Stars!

Managing indoor humidity is key to keeping your home comfortable and healthy, especially in South Florida’s tropical climate. Whether your system needs a tune-up, duct repair, or a humidity solution, All Star Plumbing and Air is here to help.

📞 Call 561-667-2900

Your trusted experts serve Palm Beach, Martin, and St. Lucie Counties, including Boca Raton, Boynton Beach, Delray Beach, Jupiter, Stuart, and Port St. Lucie.

Let’s get your home feeling fresh, cool, and perfectly comfortable again, no matter the season.