Why Is My AC Running But Not Cooling Properly?

Your AC is running but not cooling because of airflow, settings, or refrigerant issues. Typical culprits include a clogged filter, a thermostat not set to “Cool,” a blocked outdoor condenser, iced evaporator coils, duct leaks, or low refrigerant (a leak).

Quick checks:

• Replace the air filter.
• Set thermostat to Cool and lower the setpoint.
• Clear 2–3 ft around the outdoor unit and rinse debris off fins.
• Open all supply/return vents.
• If coils are iced, turn AC off to thaw. Low refrigerant needs a pro. Service available in Novato and Petaluma.

Updated: 2025-12-30 00:00:00

Need help in Rohnert Park, CA? Call (415) 862-8961 or book online.

"Roberto quickly diagnosed and repaired a heating/cooling duct issue." — Jeff K.