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Programming 7-Day programming Two pre-programmed time/temperature periods per day (occupied and unoccupied) Vacation Programming button Programmable fan continuous occupied/auto unoccupied Programmable fan on/off delays Separate set-up menus: Installer menu, User menu, Keypad lockout (total/partial) menu Comfort & Convenience Large Comfort-View™ 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) Ignition control reset Heat pump warm air start Performance Multi-stage, heat pump, or single stage up to 2-stage heat*/2-stage cool, with economizer control Auto-changeover EMR (Energy Management Recovery) System and thermostat diagnostics Compressor lockout/auxiliary run time Adjustable differential Telephone access run program (X10 module required) Energy Source Optimizer selects heat pump or fossil fuel system