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| Understanding and Wiring Heat Pump Thermostats with AUX & Em. Heat! Terminals, Colors, Fun This #HVAC Video is about Heat Pump Thermostats- the wiring color code, terminal functions, and exactly what happens inside the thermostat as well as what the difference is between the heat, aux, and emergency heat. A thorough knowledge of these functions will aid with troubleshooting procedures to solve problems with the heat pump. &neo 2019-12-20 12:25:23 |