Why your AC freezes up in Florida — and how to fix it

Why it happens

Your AC cools by moving cold refrigerant through an indoor coil. When something drops the airflow across that coil — or the refrigerant runs low — the coil gets too cold, and the heavy humidity in Florida air freezes right onto it. Once it's iced over, your system blows warm and can't keep up, usually on the hottest afternoon of the week.

First: safely thaw it

• Set the thermostat to OFF for cooling, but turn the fan to ON. Running the fan melts the ice fastest.
• Give it a few hours to fully thaw. Don't chip at the ice.
• While it thaws, replace the air filter and make sure vents aren't blocked.
• Once melted and dry, switch back to cool. If it freezes again within a day, it needs a pro.

The usual causes

• Dirty air filter. The #1 cause. In Florida's pollen and dust, filters clog fast — check monthly in summer.
• Blocked airflow. Closed vents, furniture over returns, or a dirty evaporator coil starve the system of warm air.
• Low refrigerant. Usually a slow leak. This needs a licensed tech — just topping it off without fixing the leak only delays the next freeze.
• Failing blower motor. If the fan can't move enough air, the coil freezes even with a clean filter.

How to stop it happening again

• Replace filters monthly during cooling season.
• Keep supply and return vents open and clear.
• Rinse the outdoor unit and keep it free of grass and leaves.
• Get a yearly tune-up before summer to catch low refrigerant early.

Not sure it's just a filter? Run the free troubleshooter →

Handy parts to keep around

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