The​ ​Nest​ ​Learning​ ​Thermostat​ ​learns​ ​what​ ​temperatures​ ​you​ ​like,​ ​turns​ ​itself​ ​down​ ​when​ ​you’re away​ ​and​ ​connects​ ​to​ ​your​ ​phone.​ ​So​ ​it​ ​keeps​ ​you​ ​comfortable​ ​and​ ​helps​ ​save​ ​energy.