The Ranco ETC-112000-000 Temperature Control SPDT is a versatile digital controller designed to maintain precise temperature regulation in refrigeration and HVAC systems. With an adjustable range from -30°F to 220°F and a selectable differential of 1°F–30°F, it operates by monitoring temperature and switching equipment on or off for optimal performance. https://www.partshnc.com/etc-112000-000-ranco-30220fspdt24v1-30f-dif