The Nest Learning Thermostat is a pretty cool piece of technology, and right now, Amazon has it on sale for $199 for Black Friday. Now that's not a huge discount, as it's normally $249, but that's still $50 off. Auto-Schedule - Remembers the temperatures you like and programs itself. Auto-Away - Saves energy by automatically turning itself down when you're away. Remote control - Connect the Nest thermostat to Wi-Fi to control it from your smartphone, laptop or tablet. Easy install - Most people install the Nest thermostat in 30 minutes or less.