Under normal winter operating conditions, it is not uncommon for an air-source heat pump to run for extended periods or nearly continuously on very cold days, because heat pumps are designed to provide a steady, moderate stream of warmth rather than short bursts of intense heat. However, if your heat pump runs constantly without ever satisfying the thermostat or if indoor temperatures continue to drop, it indicates an operational problem or that outdoor temperatures have fallen below the system's balance point. In extreme cold, standard heat pumps lose efficiency and may struggle to extract sufficient heat from outdoor air, requiring auxiliary electric heating strips to engage. If auxiliary strips fail or refrigerant is low, the heat pump will run indefinitely. You can verify proper operation by checking whether auxiliary heat is active, ensuring air filters are clean, and confirming that supply air feels warm.
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