Troubleshooting
AC Blowing Warm Air? Common Causes and Solutions
6 min read••
Your AC should deliver cool air, but sometimes it blows warm. Here are the most common reasons and troubleshooting steps.
When your air conditioner blows warm air, it defeats the purpose entirely. Let's identify the cause.
Quick Checks First
Thermostat Settings Verify the thermostat is set to COOL and the temperature is below room temperature. Someone may have accidentally changed it.
Check the Air Filter A severely clogged filter can restrict airflow enough to prevent proper cooling. Replace if dirty.
Look at the Outdoor Unit Is the condenser fan running? Is the unit clear of debris? Sometimes vegetation grows around it and blocks airflow.
Common Causes
Refrigerant Issues Low refrigerant from a leak is a common cause of warm air. Signs include: - Ice on refrigerant lines - Hissing or bubbling sounds - System running constantly
Compressor Problems The compressor circulates refrigerant. If it fails or struggles, cooling stops. Listen for unusual sounds.
Electrical Issues - Tripped breaker for outdoor unit - Blown fuse - Contactor failure
Frozen Evaporator Coil Paradoxically, a frozen coil can prevent cooling. If you suspect freezing, turn the system off and let it thaw.
When to Call a Professional
Contact us if: - The outdoor unit isn't running - You see ice formation - Basic troubleshooting doesn't help - The problem recurs frequently