How long should a heat pump run in heat mode?

Under normal winter operating conditions, a properly functioning heat pump should run in long, steady heating cycles lasting anywhere from fifteen to thirty minutes, or even operate almost continuously on freezing winter days. Unlike fossil fuel furnaces that blast extremely hot air in short bursts, heat pumps distribute a steady, moderate stream of warm air to maintain your target indoor temperature efficiently. If your heat pump is cycling on and off rapidly every few minutes—known as short cycling—it indicates an operational problem, such as a clogged air filter, restricted airflow, a malfunctioning thermostat, or a system safety lockout. You can verify that your heat pump cycle is normal by confirming that it maintains a steady indoor temperature and that the supply air temperature remains comfortably warm throughout the extended runtime.