The Pro Edition of Google's Nest Learning Thermostat is here. Not only does it save energy and in turn save you money, but now the Nest can control both your heating and hot water. As well as this, the latest model has a whole host of new feature, like Farsight, meaning the nest lights up and displays the temperature as you walk into the room, and can even show you the time through either a digital or analogue display. The accompanying Nest app for smartphones allows you to view your Energy History, among other features, meaning not only can you know you're saving money, you can know exactly how much.