The Honeywell Home CT31A Economy Heat/Cool Manual Thermostat is easy to adjust by moving the lever up or down and has a simple design. The analog presentation is easy to understand and it is compatible with oil or gas heating and cooling systems. 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.