Your thermostat controls about half of your energy bill - that's as much as the refrigerator, lighting, TVs, stereos and computers combined. Problem is, a lot of that energy is wasted heating and cooling an empty home. Time to take control of your energy bill with the Nest Learning Thermostat. This baby learns what temperatures you like, automatically turns itself down when you're away and can be controlled from anywhere using your mobile device. You also get detailed statistics showing how much energy you use and alerts from your thermostat with tips on how to better save energy... and money.