The Emerson Climate-White Rodgers 49S25-707 Two-Stage HP/AC Control Board is an electronic control component designed to manage compatible two-stage heat pump and air conditioning systems. It coordinates signals between the thermostat and HVAC equipment, controlling system functions such as heating, cooling, and compressor operation. This control board is used in residential heat pump... https://www.partshnc.com/49s25-707-emerson-climate-white-rodgers-two-stage-hpac-control-board