Why Is My Heat Pump Running But Not Cooling Properly?

A heat pump that runs but doesn’t cool usually has airflow, refrigerant, or control issues. Our techs commonly find dirty coils or filters, low refrigerant from a leak, thermostat miscalibration, wiring faults, a stuck reversing valve, or a blocked condensate drain. In Glendale Heights’ humid summers, debris on the outdoor unit can quickly reduce cooling.

Quick checks:

• Replace or clean the air filter.
• Clear leaves and debris around the outdoor unit.
• Set thermostat to Cool and lower the setpoint.
• Make sure supply vents are open.

Updated: 2025-12-24

Need help in St. Charles, IL? Call (331) 294-8710 or book online.