Aprilaire® Thermostat, Series: 8400, 24 VAC, 1 - 2.5 A, 5-1-1, 5-2 day Program Programmability, Dual Powered - Battery/Hardwired Power Source, 2 Heat/1 Cool Heat Pump -Stage, 4.5 sq-in LCD, Universal Display, Temperature Settings: 45 - 99 deg F, 32 - 120 deg F Ambient, -30 to 140 deg F Storage, 5 - 90% RH Humidity, +/-1 deg F Accuracy, Horizontal Mounting, RC, R, W, Y, G, C, S1, S2, 0/B, L, W2, Y2 Terminal Designation, 5-1/4 in W x 4-1/2 in H x 1 in D

• Energy savings - set back the temperature overnight and when you're away
• Progressive recovery - this feature ensures your home is always at your desired temperature by activating the heating and cooling equipment prior to a scheduled setting
• 5-1-1 day - create a different program for weekdays, Saturday and Sunday, 5-2 day - create a different program for weekdays and weekends
• A large 4.5 sq-in LCD screen with a high-contrast, backlit display for easy reading
• It works with heat pump HVAC systems and is installed by a local HVAC professional
• Easy-to-use temperature control and the ability to override the program schedule at any time
• Simultaneous temperature display of room temperature, temperature setting and outdoor temperature, in fahrenheit or celsius
• Circulate fan mode helps you prevent hot and cold spots and maintain consistent temperature throughout your home, also keeps your air cleaner
• Service reminders for your HVAC system, humidifier, dehumidifier and air filter protect your equipment and ensure the longevity of your investment
• Permanent memory - maintains programming, time and date during a power outage
• Simple setup menu to activating optional features
• Quick reference instructions on board
• Soft touch keypad
• 32 - 99 deg F display range