FAQ What is the thermostat model for HP 2C? The thermostat model for HP 2C is *BP21H50124.What are the part numbers for the furnace? The part numbers for the furnace are *DN22U00124, *BN21H00124, and *DP32H70124.What are the part numbers for the heat pump? The part numbers for the heat pump are N/A, with optional external humidistat.