The Nest has been around for a few years now, but is worth mentioning since recent incentives from utilities such as National Grid have made it more affordable. The nest is a brilliantly designed learning thermostat that programs itself through your normal day to day input. To set it up, all you have to do is answer a few basic questions and it is ready to go. The Nest has built in activity sensors that can tell whether or not you’re home, and adjust the temperature accordingly. When you are away, you can monitor the Nest via a convenient and intuitive smartphone app. Over time the nest will develop efficient habits and help you to save money on heat and electric bills. The Nest is currently priced at $249, but National Grid customers can save $100 instantly in the Nest Store.