Your heat pump is running but not cooling because of a system fault or restricted airflow. Common causes include low refrigerant, a stuck reversing valve, frozen coils/defrost issues, clogged filters or ducts, thermostat or wiring faults, or outdoor sensor/compressor problems. We perform whole-system diagnostics to find the real issue, not just the symptom, and offer same-day repairs in Denver and nearby cities.
Quick checks:
- Set thermostat to COOL and lower the setpoint.
- Replace a dirty air filter.
- Clear debris/ice from the outdoor unit.
Updated: 2026-01-30 00:00:00
Need help in Littleton, CO? Call (720) 994-7055 or book online.