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For the 2017 Hybrid the heat is
coming from the ICE. There are versions with a PTC heater but that is just to provide a tiny amount of heat during the warm up cycle. The ICE does not have an electric waterpump so without the engine running the heater stops quite quickly because there is no circulation of coolant anymore when the ICE is off.

The AC is electric and works with the engine off as well but when the battery gets low it starts the ICE again.
 

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The heated seats work of the 12V battery so that will in turn deplete the HV battery which causes the ICE to start.

The 5th generation Prime is using a heatpump for the cabin heat. The 1.6kWH battery of your 2017 hybrid doesn't have enough power to run a heatpump for an extended time.
 
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