The Nest Learning Thermostat is outstanding. It's also pricey. Google's moving downmarket with its latest release. Dubbed the Nest Thermostat, it replaces the familiar rotating ring with a touchpad on the side while retaining the overall aesthetic that's made its predecessors so popular. It still automatically adjusts to the owner's schedule, and now has a built-in display hidden behind a mirrored panel for feedback. Available now in four decor-matching colors.