Why Your AC Coil Freezes in Georgia's Humidity (And What to Do)

Published 2026-04-08 by AC Repair Macon

It sounds backwards: your air conditioner runs all night in 90-degree heat, and somehow the coil inside is covered in ice. But frozen evaporator coils are one of the most common summer calls we get across Macon — and Middle Georgia's humidity is a big reason why.

How Humidity Freezes Your Coil

Your evaporator coil pulls heat and moisture out of indoor air. When airflow drops — dirty filter, failing blower, blocked return — the coil gets too cold, and all that Georgia humidity condenses and freezes onto the fins instead of draining away. Ice builds, airflow drops further, and the cycle accelerates until the system can't cool at all.

What to Do Right Now

Turn the system off. Running a frozen AC can kill the compressor — the most expensive part in the system. Switch the thermostat fan to ON (not AUTO) to help thaw the coil, and replace your filter while you wait.

The Fix Depends on the Cause

A dirty filter is a $15 fix. Low refrigerant from a leak, a failing blower motor, or a matted coil are technician territory — usually $150 to $600 depending on the culprit. Either way, don't just thaw it and hope: the ice will be back within days if the root cause isn't fixed.

Seeing ice on your system? Call (888) 217-1674 — we'll find the actual cause, not just melt the symptom.