The AprilAire S84NSU Programmable Thermostat makes it easy to control the temperature of your home to fit your family's needs. This single-stage universal thermostat is compatible with 1H/1C heat/cool stages and 2H/1C heat pump stages. Get started quickly with best-in-class schedule setup and the all days, weekdays, weekends, or 7-day programmability options. The 1.77" (4.5cm) LCD interface gives you quick access to the programming setup, providing real-language instructions and information-no codes to remember or manuals to track down. In addition, this AprilAire Thermostat has a convenient Heat Blast option to quickly raise the temperature by 3° to 5°F and features Progressive Recovery to achieve the desired temperature just before the programmed time comes around. This smart design ensures your family stays comfortable and can enjoy your preferred settings on your schedule. The dual powered (battery or C-wire) thermostat can also alert you to filter replacements and service checks needed for your HVAC system, and two AA Alkaline batteries are included. It displays the room's actual temperature, the set temperature, and outdoor temperature (with optional outdoor temperature sensor).