The Honeywell CT31A1003/E Heat and Cool Non Programmable Thermostat features low voltage controls and a convenient snap-action switch that allows users to adjust freely between heating and cooling systems. Incredibly easy to install and compatible with a host of heating and cooling systems, this non-programmable thermostat doesn't require leveling and comes equipped with an intuitive fan control that allows you to customize your fan's operation. Whether you choose to have it run automatically with the system or set it on constant, you'll have options. Mercury free, this non-programmable thermostat comes equipped with mounting hardware and a wall plate that make the process of installation even more convenient. Easy to install and use. Fan Control - Set fan to run automatically with system or constantly on. Mercury Free. Includes mounting hardware and wall plate. Compatible with heat and cool systems.