Review: Google Nest Learning Thermostat (4th Gen)

Nest’s smart thermostats have been an icon of the smart home since they hit the market in late 2011. Nothing said smart like a device that could learn your habits and make your home operate more efficiently without having to fiddle with settings and automations. In the 13 years since, Nest Learning Thermostats have been easy to identify, with the same thick silver bezel and compact circular screen. This design was radical at a time when most smart thermostats looked like boring, rectangular, beige boxes.

Google’s fourth-generation Nest Learning Thermostat has an entirely new look, transforming what now looks like a basic tech gadget into something of an art piece for your wall. It’s got new smarts too, and includes a temperature sensor to place elsewhere in the home. It’s a refreshing upgrade to a longtime staple, and feels smart without being intrusive or overly complex—an important middle line not all smart devices find.

Slim Setup

If you’re hoping to pop the fourth-generation Nest Learning Thermostat onto the backing of a previous Nest thermostat, you’re out of luck. The thermostat base for the new model is a different size, so you’ll have to switch out the old base for the new one.

While the third-generation thermostat itself is smaller, its base is a little larger with larger connectors; the new thermostat base is smaller with positively tiny connector buttons. You’d think with the larger 3.9-inch screen that the base would be larger, but it has a smaller footprint on your wall, which is nice. It comes with an optional plate as with previous generations, but the new version is an oval rather than a rectangle. A 3.9-inch screen might not sound that big, but it looks surprisingly large on the wall if you’re used to the smaller Nest thermostats, or even something like my previous thermostat, the square Honeywell T6.

Photograph: Nena Farrell

Installing the Nest is easy; make sure your system is compatible and that you’ve flipped off the relevant breaker to cut power. The Nest app is no longer at play with this model. Google has been gradually transitioning many of its features and capabilities to the Google Home app, and that’s what you’ll use for this new model. Google Home walks you through the steps of removing your old thermostat, labeling the wires, and installing the new thermostat over it.