March 2026 · 8 min read
Your AC is running — you can hear it, feel air coming from the vents — but the house just won't get cold. The thermostat reads 82°F and it's barely budging. This is one of the most common HVAC complaints in Florida, and it has specific causes that are more prevalent here than anywhere else. Here are the 8 most likely reasons and what to do about each.
Start here — it's the most common cause and the easiest fix. Florida homes run AC nearly year-round, meaning filters clog faster than in other states. A severely clogged filter restricts airflow so dramatically that the system can't move enough air to cool the home, even while running continuously. Check your filter right now. If it's gray and dense with dust, replace it and see if cooling improves within 30 minutes.
Refrigerant is the substance that actually moves heat from inside your home to outside. When refrigerant levels drop (due to a leak), the system loses its ability to transfer heat efficiently. Signs of low refrigerant include warm air from vents, ice forming on the refrigerant lines or indoor unit, and a system that runs constantly without reaching setpoint. This requires a licensed technician — refrigerant handling is regulated and requires EPA certification.
A frozen evaporator coil is paradoxically common in Florida's summer heat. It happens when airflow across the coil is restricted (dirty filter, blocked vents, low refrigerant), causing the coil to get too cold and frost over. A frozen coil cannot absorb heat from your home's air.
What to do: Turn the system to FAN ONLY (not off) for 2–3 hours to thaw the coil. Then replace the air filter and check all vents are open. If it freezes again, call a technician — the underlying cause (low refrigerant or airflow problem) needs to be addressed.
An AC system that's too large for your home cools the air near the thermostat quickly — shutting off before it can dehumidify the air or cool distant rooms. The result is a home that feels cold near the thermostat but warm and clammy elsewhere. This is a design problem that requires proper sizing calculation to fix. It's more common than most homeowners realize, particularly in older Florida homes that had systems installed without proper load calculations.
Florida homes, particularly those built before 2000, often have ductwork running through 150°F attics with significant leaks. The EPA estimates that 20–30% of conditioned air is lost in a typical duct system. If your system is running but rooms aren't cooling, a duct inspection can identify where conditioned air is escaping before it reaches living spaces.
The outdoor unit releases the heat removed from your home. When the condenser coils are coated with dirt, leaves, or grass clippings, heat can't escape efficiently — it's like trying to release heat while wearing a coat. The system keeps running but can't keep up with the heat load. Gently rinsing the condenser coils with a garden hose (spraying from inside out) often makes a noticeable difference. Keep vegetation cut back at least 2 feet around the unit.
Some homes simply have AC systems that aren't large enough to handle the heat load on the hottest Florida days. A system sized for average conditions may struggle during 95°F+ days with high humidity. If your home cools fine on mild days but struggles when it's very hot, an undersized system may be the issue. A Manual J load calculation can determine if this is the case.
If your home's air sealing is poor, hot humid outdoor air continually infiltrates, overwhelming the AC system's ability to maintain setpoint. Common sources include gaps around doors and windows, unsealed attic hatches, gaps where pipes and wires enter the home, and unsealed recessed lights. A blower door test can quantify air leakage; sealing the worst offenders with caulk and weatherstripping can dramatically reduce the system's workload.
If you've checked the filter and vents and the problem persists, the issue is likely refrigerant, the coil, or the ductwork — all of which require a professional diagnosis. Soligo Air provides same-day service across Orlando, Kissimmee, Winter Park, and all of Central Florida.
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