The Emerson Climate–White Rodgers 1E30N-910-24V Heat Only Snap-Action Thermostat is a durable control device designed for precise temperature regulation in heating-only HVAC systems. Operating on a reliable snap-action mechanism, it ensures quick response and accurate temperature control for furnaces, boilers, and heat-only units. https://www.partshnc.com/1e30n-910-emerson-climate-white-rodgers-24v-htonly-snapaction