How Does The Nest Thermostat Know You Are Away. Your Nest Thermostat is smart enough to know when you’re at home or when you’re not with the feature called Home or Away Assist, the Nest Thermostat can utilize its built-in sensors just like the GPS location of the cell phone to automatically find if you are home or away. From that point, you can bring down the temperature if you are outside and activate when you feel that you are getting back home.
