Derek Cole explains why AC units freeze up: a clogged filter blocking airflow to the evaporator, or low refrigerant that can't absorb heat. Both problems cause the same icy result.
Why does my unit freeze? Your unit freezes because you bought that expensive— expensive allergy filter and now it can't breathe. Nah, just kidding. But no, that could be— that could be one of the situations. You could have too good of a filter and the air can't get back to the unit. If airflow is a challenge, it will freeze over because airflow is a challenge. Also, it will do it because of low refrigerant. Um, those are really the two big reasons you have that freezing problem. If you're low in refrigerant, it will freeze. Airflow problem, it will freeze.
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