Emerson 1F85U-42NP Non-Programmable Thermostat Big, clear display - easily read in low lighting Easy installation - built in level indicator, pluggable terminals and streamlined configuration menu Advanced features - keypad lock, temperature limits, backlight button Dual fuel standard - no sensors needed Non-programmable Conventional (2H/2C) - Up to 2 stages of heating and 2 stages of cooling Heat Pump (4H/2C) - Up to 4 stages of heating and 2 stages of cooling Heat only and Cool only Gas, Oil, Electric applications Millivolt and 3-wire zone valve systems