Latest Nest Thermostat Generation. How to tell which nest thermostat you have google nest thermostats look similar, and share similar software, but there are some important differences that you’ll need to know. With the old nest learning thermostat (3rd gen) you're limited to either a basic black or white design.
The nest thermostat 4th generation boasts several new features, including a larger display, faster processor, and improved sensors. With the old nest learning thermostat (3rd gen) you’re limited to either a basic black or white design.