Google offers multiple versions of their Nest smart thermostat. The flagship model, The Google Nest 3rd-Gen ($235.99), has a sharp screen and sleek metal housing and uses a 10-wire system, which means it’ll work with just about any HVAC system. It’s a little pricier than most smart thermostats, but it’s easier to see from far away, and it’s got a two-year warranty. If you don’t need as many bells and whistles, the Google Nest E is also a great option — it’s got the same smart tech under the hood as the original, but features a lower-resolution screen, a plastic housing, and a one-year warranty. The bottom line: If you’re having trouble deciding which Nest is right for you, buy a Google Nest if your HVAC system is more than 20 years old or you like the Nest’s aesthetic better. If you’ve got a more modern HVAC system and you’re on a budget, pickup a Nest E.