SUPPORTS CONVENTIONAL & HEAT PUMP SYSTEMS; DUAL FUEL WITH 2ND STAGE AUX HEAT; SUPPORTS 1 EXTERNAL TEMPERATURE SENSOR FOR INDOOR OR OUTDOOR; DIGITAL PRECISE TEMPERATURE CONTROL; AUTOMATIC HEAT/COOL CHANGEOVER; FAN CYCLE MODE PERIODICALLY CIRCULATES AIR FOR COMFORT; DISPLAY OUTDOOR TEMPERATURE & HUMIDITY OPTIONAL; INDOOR SENSOR AVERAGING WITH REMOTE SENSOR; DOES NOT NEED BATTERIES TO RETAIN SETTINGS & TIME; GRAPHIC DISPLAY OF HVAC WEEKLY USAGE; LEARNS HOW HOME HEATS & COOLS FOR EFFICIENCY & COMFORT; 7-DAY PROGRAMMABLE SCHEDULE WITH COPY FUNCTION; TEMPERATURE SETTINGS FOR HOME, NIGHT, AWAY & VACATION WHEN INTEGRATED WITH AN HAI® HOME CONTROL SYSTEM; FILTER REMINDER FOR PEAK EFFICIENCY; BUILT-IN VACATION MODE FEATURE RESTORES TEMPERATURE BEFORE RETURNING HOME; COMMUNICATES WITH HAI® HOME CONTROL SYSTEMS & OTHER MANUFACTURER'S AUTOMATION SYSTEMS; OPTIONAL REMOTE ACCESS VIA INTERNET & TELEPHONE EXPANSION PORT FOR WIRELESS COMMUNICATION; PROXIMITY/MOTION DETECTOR, SCREEN LIGHTS UP WHEN APPROACHED; CHOOSE BETWEEN 1 OF 2 DISPLAY OPTIONS BASED UPON DESIRED VIEWABLE INFORMATION—OVER 100 CUSTOMIZABLE BACKLIGHT OPTIONS; WORKS WITH ZIGBEE WIRELESS COMMUNICATION; MULTI-COLOR BACKLIGHT-ADJUSTABLE AT ANY TIME; WHITE