I have a new house with heat pump. Although the thermostat senses the outdoor temperature and will auto select cool or heat, it will not that the next important step to auto select emergency heat when outdoor temperature is below set point. What should the emergency heat set point be? Is a heat pump thermostat available that will auto select between emergency (gas), heat, and cool?

Don`t know what kind of tstat you have,BUT,most good honeywell tstats have the ability to be programed to do just what you need, if yours can do all you say it should be able to do heatpump to EMheat thingy