Why Does My AC Freeze Up?
If your indoor coil or refrigerant lines are icing up...
...that’s usually a symptom of another issue, not the root cause itself.
Common causes include:
- Dirty air filters
- Restricted airflow
- Low refrigerant
- Plugged evaporator coils
- Blower motor issues
- Thermostat settings that are too aggressive
Most systems are designed around roughly a 20° temperature difference between return air and supply air.
Trying to force extremely low indoor temperatures during very hot weather can sometimes push systems beyond their designed operating range and contribute to freezing.