The programmable, inarguably smart thermostat installs as simply as a light fixture, picks up on your living patterns, senses when and if you're home, and self-adjusts accordingly. Its learning process is simple -- with the simple dial interface, just turn the heat down at night or turn off the AC when you leave the house, and Nest picks up on your schedule and preferences. When seasons shift, all you need to do is change the temperature a few days in a row and Nest will catch on. And wherever you go, Nest web and smartphone apps let you manage energy use remotely. Learn more about availability, and why The New York Times calls it "gorgeous, elegant and very, very smart" here.