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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.

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