Under normal operating conditions and with a properly sized system, a residential heat pump typically takes between one to three hours to lower your home's indoor temperature by a few degrees and reach your thermostat setting. However, the exact cooling duration depends heavily on outdoor weather severity, starting indoor temperatures, home square footage, insulation quality, and whether your air filters are clean. If your heat pump runs for many hours without reducing indoor temperature, it may be struggling with restricted airflow, dirty coils, or low refrigerant levels from a leak. You can verify normal cooling performance by checking that supply air feels crisp and cool, and that the system eventually cycles off once the target temperature is achieved successfully.
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