What does emergency heat on a thermostat do

 what does emergency heat on a thermostat do
The EM HT (Emergency Heat) feature allows the user to use a backup heat ... This is typically used until a heating and/or cooling contractor can ...
“Emergency heat” means constantly using the backup heat. Switching your thermostat to emergency heat is you telling your heat pump this: “Hey, stop trying to pull in air from outside. Just use your backup heat.” ... Your heat pump will use the auxiliary heat on its own to supplement heating your home.
 Experts advise that the “Emergency Heat” setting only be used ... When your thermostat senses outdoor temperatures are too cold for the heat ...
What does it mean when it's on? When do I use it? Here's the short answer: You should only set the thermostat to “emergency heat” when your ...
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What does emergency heat on a thermostat do