Why Is My AC Freezing Up?
Ice on your AC lines or coil usually comes down to airflow or refrigerant. Here's what's happening and what to do before you call.
First: turn the cooling off
If you see ice on the refrigerant lines or the indoor coil, switch your thermostat from Cool to Off, and set the fan to On. Running a frozen system can damage the compressor — the most expensive part in it. Let the ice melt completely (a few hours) before anything else.
Cause #1: airflow
The coil freezes when not enough warm air moves across it. The usual suspects: a filter that's overdue for a change, closed or blocked supply vents, or a dirty evaporator coil. Check the filter first — if you can't see light through it, replace it, let the system thaw, and try again.
Cause #2: low refrigerant
A refrigerant leak lowers the pressure in the coil, which drops its temperature below freezing. Unlike a filter, this isn't a DIY fix — refrigerant work requires EPA certification, and simply topping off a leaking system without finding the leak wastes money. If a clean filter and open vents don't solve it, the refrigerant circuit needs professional diagnosis.
When to call
If the system refreezes after you've replaced the filter and confirmed airflow, stop there — repeated freeze-thaw cycles and low-charge operation shorten compressor life. That's the point where a proper diagnosis saves you money rather than costing it.
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