The Nest thermostat is a hefty spend. At $250, it’s not something you’d purchase without much though, like you probably did with the Chromecast. Nest claims to save you money, but varying reports go into how much it actually ends up saving you. Today, Nest is averaging the weight of three separately funded reports, and saying the average household will save about $138 per year they have a Nest. In two years’ time, your Nest will have paid for itself, if these reports are indicative of your use and savings.