AC Blowing Warm Air

Professional AC Blowing Warm Air in Asheville & Western NC

When your air conditioner blows warm or room-temperature air instead of cool air, something has gone wrong with the refrigeration cycle or airflow system.

What Causes an AC to Blow Warm Air

The most frequent causes include a refrigerant leak that has dropped levels too low to cool effectively, a dirty outdoor condenser coil unable to reject heat, a failed compressor, a reversing valve stuck in heating mode (heat pumps), or a thermostat set incorrectly. In some cases, the outdoor unit has shut off entirely while the indoor fan continues running, pushing unconditioned air through your vents.

Quick Things You Can Check

First, verify the thermostat is set to 'cool' (not 'heat' or 'fan only') and the set temperature is below the room temperature. Go outside and check if the outdoor unit is running — if the fan isn't spinning, the compressor isn't running either. Check the breaker and disconnect switch. If the outdoor unit is running but the air is warm, the problem is refrigerant or compressor related.

When This Becomes a Serious Problem

Running an AC with low refrigerant causes the compressor to overheat and can destroy it — the most expensive component in your system. If you're also noticing your AC running constantly or ice forming on the coil, the refrigerant level is critically low and the system needs immediate service.

When to Call for AC Repair in Asheville

If thermostat settings are correct and the outdoor unit is running, you need a technician to test refrigerant pressures and diagnose the issue. Quality Comfort provides same-day AC repair in Asheville — our technicians carry refrigerant and the tools to test system pressures, identify leaks, and get your system cooling on the first visit.