Emerson Mercury-free Mechanical Thermostat

Universal Horizontal Mechanical Thermostat for Single Stage Heat/Cool systems, 3-Wire Zone or Electric Strip Heat Compatible systems. Thermostat Mounting Plate Included. System Switch is Heat-Off-Cool and Fan is On-Auto.|Replaces most mechanical thermostats made in the last 50 years|Includes wallplate to cover marks left by old thermostat|Universal conventional heat/cool, heat or cool only, heat pump no aux, 3-wire zone valve, electric strip heat, or millivolt applications|Control range - 50 degree F to 90 degree F|Terminals RC, RH, W, Y, O, B, G, A|Includes system switches heat-off-cool and fan on-auto