Emerson Mercury-Free Mechanical Thermostat for Heat Pump Systems

Universal Veritcal Mechanical Single Stage Heat/Cool thermostat. Thermostat mounting Plate is included. Compatible with heat only, millivolt and conventional oil/electric/gas systems.|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 mV 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