During extreme summer heat waves or severe heat advisories, it is relatively normal for a residential heat pump to run for extended periods or nearly continuously, because high outdoor temperatures increase thermal gain through exterior walls and windows, requiring longer runtimes to maintain indoor comfort. However, if your heat pump runs continuously day and night without ever satisfying the thermostat setting or shutting off, it indicates an underlying problem such as an undersized system, dirty outdoor condenser coils, restricted airflow from a clogged indoor air filter, or a low refrigerant charge. You can verify whether continuous summer operation is normal by checking if the indoor temperature matches your thermostat setpoint and ensuring that supply air feels consistently cold. If the home remains warm despite continuous runtime, professional diagnostic service is required.
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