AC Freezing Up? Why There's Ice on Your AC & How to Fix It
Ice on your AC means the indoor coil got too cold, usually from poor airflow (a clogged filter or blocked vents) or low refrigerant. Switch to fan only to thaw it, replace the filter, then test again. If it refreezes, a technician needs to check airflow and refrigerant; typical AC repairs cost $150–$650.
Last reviewed September 2026
Troubleshoot it now
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Thaw it with the fan only
Switch cooling off and the fan to on. Put towels down and let the ice melt completely, which can take a few hours.
Signs it's this problem
- Ice or frost on the copper refrigerant line outside or near the indoor unit
- Very weak airflow from the vents
- Water around the indoor unit as the ice melts
- AC runs but doesn't cool
Why it happens
The evaporator coil must stay above freezing. When too little warm air passes over it, or refrigerant pressure is low, moisture on the coil freezes and the ice blocks even more airflow, making it worse.
Not sure? Run the heating and cooling problem finderHow to fix it, step by step
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Safety: Never chip or scrape ice off the coil; the fins and tubes are delicate and easily punctured.
AC Freezing Up? Why There's Ice on Your AC & How to Fix It cost
| Job | Typical cost |
|---|---|
| Typical AC repair | $150–$650 |
| Leak repair and recharge (if refrigerant is low) | $200–$1,600 |
Got a quote? Check if it's fair
Typical professional price for this job: $150–$650
Common questions
Can I run my AC while it's frozen?
No. Running cooling on a frozen coil can send liquid refrigerant back to the compressor and damage it. Thaw it with the fan only first.
How long does it take a frozen AC to thaw?
Usually a few hours with the fan running, and up to a day for heavy ice.