This low voltage thermostat from Emerson will help ensure your heating and cooling system is running smoothly. This low voltage thermostat is designed with a control range of 45 degrees to 99 degrees F. It comes complete with 1 cooling stage and 1 heating stage. It is completely programmable with many options and time settings. Boasting auto-on fan switching, you'll be blown away by its effortless operation. Like new condition! Was only used for 3 months.