The Honeywell L404F1094 20-300 Spdt Snap Sw Trol is a single-pole, double-throw (SPDT) snap switch designed for use with Honeywell thermostats. In your HVAC system, it controls airflow as a manual temperature controller. You can accurately regulate your comfort level with a range of 20 to 300 degrees Fahrenheit. The cooling system is activated by the switch when the temperature exceed... https://www.partshnc.com/20-300-spdt-snap-sw-trol-2