The Johnson Controls A421ABC-02 is an SPDT electronic temperature control sensor designed for precise temperature regulation in HVAC systems. It features a remote bulb type sensor, making it ideal for applications requiring remote temperature monitoring. With a temperature range of -40°F to 212°F, this sensor is versatile for both heating and cooling operations. https://www.partshnc.com/120240v-spdt-40212f-6-sen