Emerson 1F72-151 5-2 Day Programmable Thermostat for Heat Pump Systems 5-2 day programmable thermostat - set different schedules for weekdays and weekend Works with heat pump systems (2H/1C); not compatible with millivolt and 3-wire zone valve systems Large, easy-to-read LCD display with backlight (hardwired) Precise temperature control of plus/minus 1 Degree for maximum comfort