Thanks, everyone I have been tinkering with the thermostat, and have determined Zone 1 is the only Zone1. there is no Zone 2, HP is the heat strip, heating air through the heat pump on the ceiling When I select furnace on the thermostat and use it for heat it gets really hot in the RV really fast. almost to fast, and so warm, I find I am always adjusting the Temp on the thermostat up and down to turn it on and off. how do other folks use the furnace settings?