Why Is My AC Freezing Up?

Ice on an air-conditioning system is a sign that normal operation has been disrupted. Continuing to run the system while it's frozen can make diagnosis harder and may contribute to additional problems.

Airflow problems

Restricted airflow is one possible contributor. Check accessible items such as filter condition and blocked vents without opening equipment.

System problems

Other causes may require HVAC diagnosis. Don't assume replacing the filter will solve every freeze-up.

Turn off cooling if the system is frozen

Allowing the system to keep trying to cool while ice is present isn't a good troubleshooting strategy. Follow manufacturer guidance and arrange service when appropriate.

Watch the water afterward

As ice melts, water may appear around the equipment. Make sure it isn't causing damage.

When should I get help?

Professional evaluation makes sense when ice returns, the system doesn't cool normally, airflow remains weak, water is leaking, or the cause isn't obvious. Find Local HVAC Help