What’s new in the 4th Gen
The 4th Gen has a display 60% larger than its predecessor, a Nest Temperature Sensor in the box, and Matter over Wi-Fi.
Matter is the big change: according to AppleInsider, it now works properly in Apple Home, and it also joins Alexa and SmartThings.
Installation and wiring
Source · Tom's GuideAccording to Tom’s Guide, the 4th Gen doesn’t need a C-wire in most setups because of Google’s Power Sharing.
Still, check compatibility before you buy:
- 1Turn off power to your heating and cooling at the breaker.
- 2Remove your current thermostat’s cover and take a clear photo of the wiring.
- 3Enter the wire labels into Google’s online compatibility checker.
- 4If you’re upgrading from an older Nest, plan for a full reinstall with the new base.
Will it save you money?
ENERGY STAR says certified smart thermostats save about 8% of heating and cooling bills on average, and heating and cooling make up nearly half a typical US household’s energy costs.
Your results depend on climate, comfort settings and how often the home is empty. The biggest savings come from letting it set back the temperature when you’re out or asleep.
The downsides
It’s one of the most expensive thermostats.
The included remote sensor only works in the Google Home app, not through Matter. And it’s not a renter’s device: changing a thermostat means touching your heating system.
