I have no idea why there's a second thermostat. In general, the thermostats use the term "auxiliary" when the heat strips are supplementing the heat pump. They use the term "emergency" when the heat pump is locked out and only the heat strips are heating the house.
source https://www.inspectorsjournal.com/topic/18827-quick-heat-pump-help-please/?do=findComment&comment=172288
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