I have a new infinity 2 stage gas furnace and 2 stage heat pump. I think the system is working correctly however my infinity thermostat behaves slightly differently from what is described in the manual. When the heat pump can not maintain the temperature, the gas furnace will take over and the thermostat will indicate that "auxiliary heat" is active. This I belive is noraml. However, the owners manual indicates that the system can be manually placed into "emergency heat" by pushing the heat button for 4 seconds. When I do this with my system the infinity thermostat reads "furnace only" even though the owners manual states it should read "emergency heat". In this mode when the furnce turns on the thermostat then reads "auxiliary heat". The system seems to work as expected but I am curious why my thermostat indicates something different then the owners manual. The manual seems to make a distiction between emergency heat and auxiliary heat.