Why is my AC not cooling?
Common reasons: dirty air filters, low refrigerant, frozen evaporator coils, or faulty compressor. Check your filter and thermostat first.
AC Not Cooling: Troubleshooting
When your AC runs but doesn't cool, several issues could be the cause.
DIY Checks
Check thermostat settings, air filter condition, and that all vents are open. A clogged filter is the most common cause of AC problems.
Professional Issues
Low refrigerant, frozen evaporator coil, failing compressor, and electrical issues like bad capacitors require professional service.
Outdoor Unit
Ensure 2 feet clearance around the condenser. Clean dirty coils with a garden hose. Listen for unusual sounds.
When to Call a Pro
Call if the system blows warm air after checking basics, you see ice on lines, the outdoor unit isn't running, or you hear unusual sounds. Most repairs cost $150-$650.
Related Questions
Can a dirty filter stop cooling?
Yes, dirty filters are the #1 cause of AC problems. They restrict airflow and cause the evaporator coil to freeze.
Why is my AC blowing warm air?
Usually means low refrigerant, failed compressor, or a refrigerant leak. Requires professional diagnosis.
How much to fix?
Filter: under $20. Refrigerant: $200-$500. Capacitor: $150-$400. Compressor: $1,000-$2,500.