Nest 2.0

When Apple updates a product, it typically improves it in small but noticeable ways, while making it slimmer and sleek. Considering the company's background, it's no surprise then that the same thing has happened with the Nest 2.0 ($250). This second-generation learning thermostat features a design that's 20% thinner, with a new, single solid stainless steel ring, a smooth lens to cover the sensors instead of a grille, and updated software. Most importantly for us, though, is the new asterisk connector that opens up compatibility with far more heating and cooling systems, meaning we can finally put some of these in our homes.