Running a residential heat pump continuously during extreme summer weather is not necessarily bad, provided the system is maintaining a comfortable indoor temperature and functioning efficiently. Heat pumps are designed to operate for long, steady runtimes rather than short cycling rapidly, especially during severe heat waves when high outdoor temperatures increase heat gain inside your home. However, if your heat pump runs continuously day and night without ever satisfying the thermostat or shutting off, it indicates an underlying problem such as an undersized system, dirty condenser coils, restricted airflow from a clogged filter, or a low refrigerant charge. You can verify whether continuous operation is normal by checking if the indoor temperature matches your thermostat setting and ensuring that supply air feels consistently cold.
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