#1 : Save up to 26% per year on heating and cooling costs. ENERGY STAR certified. Included Smart Sensor (50 dollar value) adjusts the temperature in the rooms that matter most to reduce hot or cold spots to keep you comfortable. Compared to a hold of 72F. #2: Built-in air quality monitor alerts you to poor air quality, provides tips on how to improve it, and reminds you when it's time to change your furnace's air filter. Premium materials and advanced engineering mean a large, vibrant display with a cinematic interface, a timeless design, and next level occupancy sensing. Ecobee Smart Thermostat Premium is a complete home monitoring hub that includes built-in smoke alarm detection and alerts to possible break-ins when your system is armed. Get notifications during sudden temperature drops that could cause damage. ecobee Smart Security plan required. #3: Comes with a smart speaker and your choice of Siri or Alexa Built-in. Control your home using the power of your voice and listen to your favorite Spotify playlists and podcast through your thermostat's speaker. A le home hub required to enable Siri on Smart Thermostat Premium.