Why Is My AC Freezing Up? (Ice on the Unit Explained)
Finding ice on your air conditioner is confusing, but the causes are usually straightforward. Here’s what’s happening, what to do right now, and when to bring in a pro.
What causes an AC to freeze up?
Ice forms when the coil gets too cold, and that usually traces back to one of three things: restricted airflow, low refrigerant, or a dirty coil.
Restricted airflow is the most common and most fixable. Low refrigerant and a dirty coil point to issues that need a technician.
Could it just be a dirty filter?
Very often, yes. A clogged filter chokes the airflow across the coil, the coil gets too cold, and moisture freezes on it. It’s the first thing to check because it’s the easiest to fix.
If your filter is gray and packed, replacing it is a great first move.
What should I do right now?
Turn the system off and let the ice thaw completely, which can take a few hours. Running it while frozen can damage the compressor, which is an expensive part you want to protect.
While it thaws, replace a dirty filter and make sure vents and returns aren’t blocked. Once fully thawed, you can try running it again.
When should I call a professional?
If it freezes up again after a fresh filter and a full thaw, that points to low refrigerant or a coil issue, and those need a licensed technician. Low refrigerant in particular usually means a leak, which won’t fix itself.
There’s no safe DIY for refrigerant, so that’s our cue to step in.
If your AC keeps icing over after the basics, don’t keep forcing it, that’s hard on the system. Call or text and we’ll find the real cause and get you cooling again.