The first I heard of this amazing device, was when my Son bought one. As he is a Gadget Orientated fellow, I was all ears to learn what it was. This thermostat learns your heating/cooling habits and sets up a schedule automatically. It is Wi-fi controllable, has a built in menu systems for settings, and sends a monthy report of your energy use to your email address. It also has an away mode that you can set up with minimum heating or cooling settings. Picture this in your mind; you are away for the weekend, you have the thermostat set for away. You are on your way home and connect with your smartphone or tablet to tell the thermostat to start up and have your house nice and cozy when you get there. Not bad.
For Reviews and more info Nest Learning Thermostat – 2nd Generation T200577