Why Is My Heat Pump Running But Not Cooling Properly?

Your heat pump is running but not cooling when airflow, settings, or the outdoor unit are compromised. Common causes include a dirty filter, thermostat not set to Cool, blocked or iced outdoor coil, low refrigerant, or a failed fan/capacitor. Diamond Heating and Cooling provides 24/7 emergency service in Boise and the Treasure Valley, and we offer a free second opinion on major HVAC repairs.

Quick checks:

• Set thermostat to Cool and lower 5°F.
• Replace/clean the filter.
• Clear leaves/debris from the outdoor unit.
• Look for ice on lines or coil; turn system Off and to Fan.
• If problems persist, schedule service.

Updated: 2025-11-05

Need help in Boise, ID? Call (208) 378-6624 or book online.

"The new heat pump and furnace were surprisingly quiet." — J. S.