Short YouTube instructional clip by Derek Cole explaining how to tell if emergency/auxiliary heat is active: check the thermostat for a red light or an 'auxiliary/emergency heat' indicator on digital or older thermostats.
One way to know that it's actually on is by going to your thermostat. It should indicate emergency heat with the red light or auxiliary heat should be on the digital version. If you have an old school thermostat, you see the auxiliary or emergency heat light on. There's one way to find out.
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