I am setting up a Nest with a heat pump, dual fuel (heat pump + gas

Nest Aux Heat. Nest Heat Pump With Auxiliary Heat Wiring Support Nest / If the It comes into play when the primary heating system, typically a heat pump, struggles to maintain the desired indoor temperature due to extremely low outdoor temperatures. In my opinion Nest turns on aux too early for newer models HVAC

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Nest Thermostat's "Auxiliary Heat" Operating Mode How Aux Heat is Effected by Heat Pump Balance Settings

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This means your compressor if capable should still be used to 15 degrees after than Aux is used. You can change it from the Nest app or from your thermostat For example, if your AUX lockout temp is 40ºF or 4.4ºC, then AUX heat will come on when the outdoor temperature is below 40ºF or 4.4ºC.

Nest Thermostat, HZ432, Heat Pump with Aux. Heat — Heating Help The Wall. If it gets colder outside than the set lockout temperature, your heat pump will use AUX heat It comes into play when the primary heating system, typically a heat pump, struggles to maintain the desired indoor temperature due to extremely low outdoor temperatures.

Nest Heat Pump Settings. You can change it from the Nest app or from your thermostat How Aux Heat is Effected by Heat Pump Balance Settings