The C17-100 SPDT 2 Stage Heat/Cool Control is Designed to Replace OEM Controls which Govern the On/Off Compressor Function. Heat and Cool Controls are Found on Room Air Conditioners such as Packaged Terminal, Room and Thru-the-Wall Heat and Cool Units. Unit Features a 71 to 101 F Cooling and 64 to 94 F Heating Temperature with a 3.5 F Differential and a 3/8" X 8-9/16" Bulb with 26" Capillary