No longer available - see model 1F95-1277 One model replaces many competitive commercial models, with no need for multiple sub-bases. It's system-selectable between single stage, multi-stage and heat pump. Easy, menu-driven set-up and programming. The digital remote sensing capability is unsurpassed in accuracy, reliability and versatility. Programming 7-Day programming Four pre-programmed time/temperature periods per day Vacation Programming button Programmable fan continuous in any period Programmable fan on/off delays Separate set-up menus: Installer menu, User menu, Keypad lockout (total/partial) menu Comfort & Convenience Large Comfort-ViewT display and lighted keypad Permanent program retention - no batteries required Daylight Savings Time quick-change button Air filter change indicator Remote sensing (optional) Outdoor temperature sensing (optional) Heat pump warm air start Performance Auto-changeover EMR (Energy Management Recovery) System and thermostat diagnostics Meets ENERGY STAR® specifications Meets California Building Code, Title 24 Compressor lockout/Auxiliary run time Adjustable differential Telephone access run program (X10 module required) Energy Source Optimizer selects heat pump or fossil fuel system