Drain lines and drip pans can also get clogged after years of use, as ice can build and prevent water from filtering correctly. Still, you don’t want things to get too cold, as frozen indoor coils indicate airflow issues, typically due to debris surrounding your unit, dirty air filters, or blocked ducts.

If your unit has frozen, turn it off to let it defrost naturally. Even after this, it’s essential for the integrity of your system that you contact a professional to diagnose the problem immediately.