Smart Home · Review
Google's fourth-generation Nest Learning Thermostat refreshes the familiar round design with a larger borderless display, broader HVAC controls, Matter support and an included second-generation temperature sensor.
A polished smart-thermostat upgrade for compatible 24V HVAC systems, particularly when room-level temperature sensing and Google Home integration matter. Compatibility should be checked before purchase.
Check Current Price on Amazon →(paid link)- Google Home and Matter households
- Homes with noticeable hot or cold rooms
- Owners wanting automatic scheduling and energy features
- Your HVAC system fails Google's compatibility check
- You need a thermostat for a non-supported voltage/system
- You want the least expensive basic programmable thermostat
Nest Learning Thermostat (4th gen) + Nest Temperature Sensor (2nd gen): What You Should Know
Google's fourth-generation Nest Learning Thermostat refreshes the familiar round design with a larger borderless display, broader HVAC controls, Matter support and an included second-generation temperature sensor.
This article is based on current manufacturer documentation and product specifications. It does not claim hands-on testing, and availability, configurations and software features can change.
Key Specifications
| Display | 2.68in circular LCD, 600×600 |
|---|---|
| Size | 3.9in diameter × 1.1in deep |
| Connectivity | Wi-Fi 2.4GHz / 5GHz |
| Smart-home support | Google Home and Matter |
| HVAC voltage | 20–30VAC |
| Included accessory | Nest Temperature Sensor (2nd gen) |
A Larger, More Informative Display
Google describes the fourth-generation model as having a 60% larger borderless display than the prior generation. Dynamic Farsight can surface information such as temperature, weather and humidity from across the room.
The Temperature Sensor Is Included
The retail bundle includes one Nest Temperature Sensor (2nd gen). Placing it in another room can help the thermostat prioritize that room's temperature at selected times, which is useful when the thermostat location does not represent the whole home.
Compatibility Comes First
Google says the thermostat works with most 24V systems, including gas, electric, oil, forced-air, heat-pump and radiant systems. A C wire is not required in most homes, but Google notes that a small number of installations need one or a Nest Power Connector.
See Nest Learning Thermostat (4th gen) + Nest Temperature Sensor (2nd gen) on Amazon →(paid link)Matter and Google Home Control
Setup uses the Google Home app, and Matter support broadens smart-home control beyond a Google-only setup. Wi-Fi supports both 2.4GHz and 5GHz networks.
The Upgrade Question
The 4th gen is most compelling when you value its larger display, included room sensor and expanded HVAC support. Owners satisfied with an existing compatible smart thermostat should compare those additions with the cost of replacing working hardware.
Pros and Cons
- 2.68in circular LCD, 600×600 headline capability
- Strong automation within its product category
- Official ecosystem/app support
- Clear fit for buyers who will use its advanced features
- Advanced hardware can add cost and complexity
- Your HVAC system fails Google's compatibility check
- Features and compatibility should be checked for your exact setup
Who Should Buy It?
Google Home and Matter households, homes with noticeable hot or cold rooms, and owners wanting automatic scheduling and energy features.
Frequently Asked Questions
What is the key reason to consider the Nest Learning Thermostat (4th gen) + Nest Temperature Sensor (2nd gen)?
A polished smart-thermostat upgrade for compatible 24V HVAC systems, particularly when room-level temperature sensing and Google Home integration matter. Compatibility should be checked before purchase.
Does it require checking compatibility or home setup?
Yes. Review the manufacturer's current compatibility, space, network and installation requirements that apply to your home before ordering.
Does this review include hands-on testing?
No. This is a research-based buyer guide grounded in manufacturer documentation and verified product identity.
Should I rely on a price quoted in this article?
No fixed Amazon price is quoted because prices, promotions, stock and configurations change. Use the Amazon listing to check the current offer.