Emerson 1F83H-21NP Heat Pump (2H/1C) 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 Heat Pump (2H/1C) - Up to 2 stages of heating and 1 stage of cooling Heat only and Cool only Gas, Oil, Electric applications Millivolt and 3-wire zone valve systems