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AC Not Cooling? Common Causes & What to Check

An AC that runs but doesn't cool usually has a refrigerant, electrical, or airflow problem. This guide covers the common causes and what to check.

Check the Filter and Airflow

A clogged filter restricts airflow and can cause the coil to freeze. Check and replace the filter first.

Refrigerant

Low refrigerant means the AC can't absorb enough heat. This requires a technician to find and repair the leak.

Capacitor and Contactor

A failed capacitor or contactor can stop the compressor or fan from running.

When to Call a Professional

If the filter is clean and the AC still won't cool, request AC repair.

Frequently Asked Questions

Common causes are low refrigerant, a failed capacitor, or restricted airflow. Request AC repair.

Request service

Submit a service request and a coordinator will contact you to confirm technician availability. We do not confirm an appointment until availability is verified.

What happens next: A coordinator reviews your request, confirms the service type and location, and contacts you to schedule.

For emergencies: Call (312) 555-HVAC or request emergency service. For a gas leak or carbon monoxide, leave the building and call your gas utility or 911 first.

Request HVAC Service

A coordinator contacts you to confirm availability. No appointment is confirmed until verified.

Prefer to call? (312) 555-HVAC

Request service

Submit a service request and a coordinator will contact you to confirm technician availability. We do not confirm an appointment until availability is verified.