snippet: This is an OEM replacement control board for select Dometic or Duo-Therm Penguin and Blizzard Air Conditioners. Designed for single zone use, offering cooling, heat pump and furnace control. The control board is the brain of the air conditioning system, communicating the settings from your wall thermostat to the A/C and the furnace. Compatible with Dometic Air Conditioners: 651916, H551916 (Page 1)