The EM HT (Emergency Heat) feature allows the user to use a backup heat source when the heat pump is not working. The Emergency Heat feature locks out the heat pump compressor so that only backup heat is used.
The Emergency Heat switch on a Heat Pump thermostat confuses many people. The fact of the matter is that most people don't seem to understand exactly what ...
- I have the dual fuel type of heat pump and want to know how I can disable the emergency heat mode on the Honeywell thermostat. David Butler.
You've seen the “Emergency Heat” or “Em Heat” setting on your heat pump's thermostat but you have no idea what it means or when to use it.