Keep your home comfortable and your indoor air fresh with the Aprilaire Wi-Fi Thermostat with Event-Based Air Cleaning. Designed for use with most HVAC systems, this programmable thermostat connects to the Internet over Wi-Fi, so you can view and adjust settings from anywhere, either through your free online account or with the free mobile app. Advanced features (most notably the automatic ventilation option) allow you to schedule changes based on a variety of events, making it easier than ever to conserve energy without sacrificing your comfort at home. The app, available free for iOS and Android devices, syncs with the thermostat to provide seamless control. Features disabled from the thermostat are also automatically removed from the app. The thermostat not only offers standard 7-day programming (up to 4 events per day), but also a "progressive recovery" feature that can activate your heating or cooling equipment BEFORE a scheduled event, so that when it's time for the event to start, your home has already reached your desired temperature. The thermostat also provides automatic ventilation when it detects specific conditions in your home. You can set parameters that trigger ventilation, and/or take advantage of "Event-Based Air Cleaning". FEATURES: Universal for 2H/2C or 4H/2C heat pump. Clock and date display with daylight savings adjustment. Auto changeover with deadband adjustment (both heat and cool setpoints). Adjustable differential (allowed temperature drop between heat/cool stages). Stage rate feature engages additional stages to achieve setpoint. Dual fuel kit allows switching between two equipment types. Balance point control allows optimization of heat pumps and aux heat. Built-in compressor protection. Auto backlight with first button press. 3-day weather forecast with pollen and mold levels. System test mode. Warranty: 5 Years. CONTENTS: Thermostat, Mounting Hardware. NOTE: Requires a computer or mobile device with Wi-Fi and a web browser.