I guess the only difference is that AUX is an ‘indicator’ on your thermostat that you are running the heat strips when the switch is set to HEAT. Emergency Heat is just the switch setting that will turn off the heat pump and only run the auxiliary heat. Emergency Heat Indicator only when in Em. Heat Mode.Click to see full answer. Keeping this in view, what is EM heat on a thermostat?Emergency Heat, also known as Auxiliary Heat, is the second stage of heat that your thermostat utilizes when the temperature is too cold for your heat pump to remove heat from the outside. The outdoor temperature that usually triggers the Emergency Heat setting to turn on is 35°F and below.Beside above, does EM heat cost more? If your heating system works with an all-electric heat pump, then yes, it will cost considerably more to run emergency heat. The cost of running an emergency backup that runs on oil or gas may depend upon the cost of the fuel used and how much of it is required. In respect to this, at what temperature should you switch to emergency heat? Your emergency heat setting automatically turns on when outside temperatures drop below a certain temperature, usually 30 degrees Fahrenheit. If you need to manually turn it on, you should call an HVAC professional to get your heat pump fixed.Why is my heat blowing cold air?Your furnace may be blowing cold air because the filter is too dirty. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack.
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