Walked into a room and got chilled to the bone? The third generation Nest Learning Thermostat can rectify that. While its FarSight software automatically changes the temperature based on movement in the room, its Furnace Heads-Up uses an advanced diagnostic method to notify users about possible problems with the heating system. It also comes equipped with NestCam which begins auto recording depending on whether you are home or away as an added security feature. Website: www.nest.com.