Derek Cole explains what the AUX light on your thermostat means: your electric heat strips are running as backup heat because it's below 40°F outside. This is normal when your heat pump can't keep up in cold weather.
If you see the thermostat, go to aux and that red light pops up or it's flashing. That just means the heat strips are on. It's nothing to worry about. It's normal, it's fine. It's really a backup heat source because once it gets below 40 outside and you have a heat pump, it needs help. So that's why you have these heat strips to kind of give a hand to add he.
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