If your home's HVAC system uses a heat pump, it's likely that there is an emergency heat or EM ... And while not all thermostats come with an EM function, systems that use a heat pump, as well ...

If you’re not ... on emergency heat manually. You can continue using emergency heat while you wait for a service technician to come take a look, or while you wait for your heat pump to defrost.

If you’re not ... heat activated, which may happen automatically in ultra-cold weather. (Photo: Getty Images) You can continue using emergency heat while you wait for a service technician to ...