Programmable smart thermostat that learns your schedule and the temperatures you like and programs itself to help you save energy and stay comfortableHome/Away Assist automatically adjusts itself to an Eco Temperature after you leave, so you don’t heat or cool an empty home; remote control lets you change the temperature from anywhere on your phone, laptop, or tablet[1]With Energy History, just check your phone to see how much energy you used and why, or use Quick View on the display to reach Energy History, settings, or your schedule; the Nest Leaf appears when you choose a temperature that saves energySmart thermostat with HVAC monitoring, which looks out for your heating and cooling systems; sends an alert if something doesn’t seem right, along with helpful reminders to make maintenance easier[2]The Nest Learning Thermostat works with the Nest Temperature Sensor (sold separately) to help make sure a certain room is the exact temperature you want it to be