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For homeowners, the important question is not simply whether it looks newer. It is whether your heating and cooling system is compatible, whether the new features solve a real comfort problem, and whether Google Home suits the way you want to manage your home.
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Why the new Nest matters
The gap is specifically between generations of the Learning Thermostat: the original launched in 2011, the 2nd gen followed in 2012, the 3rd gen in 2015, and the 4th gen in 2024. Google also sells a separate, less expensive product called the Nest Thermostat, so “new Nest thermostat” can refer to two different products.
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →The 4th gen remains Google’s premium thermostat. As of 2026, Google lists it at software version 2.4, with an April 30, 2026 update adding on-device setup screens, expanded heat-pump support, advanced equipment configuration, and Matter bridge support for thermostat sensors. See Google’s software release history.
#1 Best Overall
- Nest’s smartest, most advanced thermostat yet, the Google Nest Learning Thermostat (4th gen) is a beautiful, brilliant way to save energy, keep your home comfortable, and help make sure your heating and cooling systems are running smoothly[4]
- Savings you can count on: The Nest Learning Thermostat can help save up to 31% on heating and cooling bills[2]
- Improved compatibility: It works with most 24V systems, including gas, electric, oil, forced air, heat pump, and radiant, and no C wire is required for installation in most homes; visit the Nest Compatibility Checker for more info[5]
- Easy control in the Google Home app: Adjust on your phone from anywhere[1] or by using your voice with Alexa, Siri, or Google Assistant smart speaker[3], it’s easy to install yourself and it’s Matter compatible for simple integration into your smart home[5]
- Beautiful design: With a 60% larger display[11] and Dynamic Farsight, you can see info from across the room[1]; choose the design, like a clock or the weather; it automatically adjusts brightness for the best readability or you can adjust manually
What changed from the 3rd generation?
A larger display and redesigned hardware
The 4th gen has a 2.4-inch color LCD, a thinner exterior, and a redesigned interface. It can show the current and target temperature, weather information, system status, and other comfort or energy details depending on the installation, sensors, location, and software.
It also uses a new wall plate. That means it should not be treated as a simple faceplate swap for a 3rd-generation thermostat. Replacing it may involve removing the old backplate, reconnecting wires, testing the equipment, and dealing with visible paint marks or unused wall holes.
Expanded HVAC support
Google says the 4th gen supports most 24-volt systems, including gas, electric and oil heating, forced-air systems, heat pumps, radiant systems, and supported humidifier, dehumidifier and ventilation equipment.
Its stated staging limits include up to two cooling stages and three conventional heating stages. For heat pumps, it supports up to two heat-pump heating stages, two alternate-heating stages, and two cooling stages. Exact compatibility still depends on the equipment, wiring, control board and regional system design. Check Google’s compatibility documentation before buying or removing the existing thermostat.
New temperature-sensor support
The 4th gen works with the Nest Temperature Sensor (2nd gen). A sensor can help when the wall thermostat is in a hallway, near a draft, downstairs while bedrooms are upstairs, or somewhere that does not represent the room occupants care about most.
A sensor does not create a separate HVAC zone. It changes which temperature reading the thermostat uses for control. It also cannot correct poor duct design, inadequate insulation, restricted airflow or a mechanical zoning problem. Placement matters: avoid direct sunlight, supply vents, exterior doors and rooms that are rarely occupied. The sensor is available from Google’s store.
Rank #2
- Nest’s smartest, most advanced thermostat yet, the Google Nest Learning Thermostat (4th gen) is a beautiful, brilliant way to save energy, keep your home comfortable, and help make sure your heating and cooling systems are running smoothly[4]
- Savings you can count on: The Nest Learning Thermostat can help save up to 31% on heating and cooling bills [2]
- Improved compatibility: It works with most 24V systems, including gas, electric, oil, forced air, heat pump, and radiant, and no C wire is required for installation in most homes; visit the Nest Compatibility Checker for more info[5]
- Easy control in the Google Home app: Adjust on your phone from anywhere[1] or by using your voice with Alexa, Siri, or Google Assistant smart speaker[3], it’s easy to install yourself and it’s Matter compatible for simple integration into your smart home[5]
- Beautiful design: With a 60% larger display[11] and Dynamic Farsight, you can see info from across the room[1]; choose the design, like a clock or the weather; it automatically adjusts brightness for the best readability or you can adjust manually
Adaptive Eco and Smart Schedule
Adaptive Eco adjusts energy-saving behavior using factors such as occupancy, weather and household patterns. Smart Schedule can suggest changes based on observed routines and conditions. You can review or decline suggestions.
These features are designed to help reduce energy use, but they do not guarantee a particular bill reduction. Results depend on climate, insulation, HVAC efficiency, utility rates, occupancy, temperature preferences and whether the household accepts wider temperature changes.
Matter support
The thermostat is Matter-certified and can work with compatible Matter ecosystems, including Google Home and other Matter-enabled platforms. However, Matter does not mean every Google feature appears identically in Alexa, Apple Home, SmartThings or another third-party app.
Basic thermostat control may work across platforms, while learning behavior, energy history, Smart Schedule, Adaptive Eco and sensor-related features may remain dependent on Google Home. Matter improves interoperability; it does not make the thermostat completely platform-neutral.
4th gen versus 3rd gen
| Consideration | Nest Learning Thermostat (4th gen) | Nest Learning Thermostat (3rd gen) |
|---|---|---|
| Launch timing | August 20, 2024 | 2015 |
| Display | 2.4-inch color LCD with redesigned interface | Older display and interface |
| App | Google Home is required for setup | Existing owners may use the Nest app experience |
| Sensors | Supports the 2nd-generation Nest Temperature Sensor | Different hardware and sensor path |
| Smart home | Matter support, with Google-specific features remaining in Google Home | Older connectivity and support path |
| Installation | New wall plate; may require rewiring | Existing installation |
| Best reason to upgrade | Newer HVAC support, sensors, Matter and Google Home features | Keep it if it works reliably and meets your needs |
The 4th gen is not automatically a better energy-saving investment for every 3rd-generation owner. Its strongest advantages are newer smart-home compatibility, room-temperature prioritization, broader equipment support and longer-term product relevance.
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The thermostat is intended for 24-volt HVAC systems, but “24 volts” alone does not prove compatibility. Proprietary communicating systems, complex zoning panels, unusual relays, high-voltage electric baseboard systems, millivolt systems and some international configurations can create problems. Heat pumps, boilers, radiant systems and accessory equipment also need to be checked carefully.
Rank #3
- Nest’s smartest, most advanced thermostat yet, the Google Nest Learning Thermostat (4th gen) is a beautiful, brilliant way to save energy, keep your home comfortable, and help make sure your heating and cooling systems are running smoothly[4]
- Savings you can count on: The Nest Learning Thermostat can help save up to 31% on heating and cooling bills[2]
- Improved compatibility: It works with most 24V systems, including gas, electric, oil, forced air, heat pump, and radiant, and no C wire is required for installation in most homes; visit the Nest Compatibility Checker for more info[5]
- Easy control in the Google Home app: Adjust on your phone from anywhere[1] or by using your voice with Alexa, Siri, or Google Assistant smart speaker[3], it’s easy to install yourself and it’s Matter compatible for simple integration into your smart home[5]
- Beautiful design: With a 60% larger display[11] and Dynamic Farsight, you can see info from across the room[1]; choose the design, like a clock or the weather; it automatically adjusts brightness for the best readability or you can adjust manually
Do not rely solely on wire color. Terminal labels, equipment type, staging and the control arrangement matter more. A C wire, power accessory or another wiring arrangement may be required depending on the system; there is no universal rule that every installation requires one or that none do.
A typical replacement involves:
- Confirming compatibility using Google’s compatibility guidance.
- Turning off HVAC power at the breaker or service switch.
- Photographing and labeling the existing wiring.
- Removing the old thermostat and backplate.
- Installing the 4th-generation wall plate.
- Connecting wires according to the Google Home setup flow.
- Testing heating, cooling and accessories before relying on the system.
If the compatibility checker reports an unsupported system, stop before wiring the thermostat. Identify the HVAC model and control board, check for zoning or proprietary controls, and use a qualified installer where necessary. A professional assessment is especially sensible for multi-stage heat pumps, zoning panels, unusual relays or wiring that is not clearly identified.
Google Home is required
The 4th gen must be set up in the Google Home app; do not begin in the Nest app. This is a practical change for long-time Nest owners, even if the physical installation is straightforward.
Google Home remains the primary management platform for setup, configuration, schedules and many advanced features. Buyers who prefer the older Nest app or want to avoid dependence on a Google account should treat that as a significant purchasing consideration.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What older Nest owners need to know
1st- and 2nd-generation models
Google ended app and online support for 1st- and 2nd-generation Nest Learning Thermostats on October 25, 2025. Their local controls and stored schedules may continue to work, but remote control, notifications and app access no longer do. This is not the same as saying every older Nest thermostat lost support.
Eligible users in the United States and Canada were offered a reduced-price 4th gen at $149.99 in the U.S. or CA$219.99 in Canada. Eligibility and redemption should be checked through the relevant Google account. Details are in Google’s support notice.
Rank #4
- ENERGY STAR certified smart thermostat for home that helps you save energy and stay comfortable.Connectivity : Wi-Fi - 802.11b/g/n 2.4 GHz, 802.11a/n 5 GHz Wi-Fi., Wireless interconnect : Bluetooth Low Energy Please refer to the product description section below for all applicable legal disclaimers.Product note: You can also check your system’s compatibility before purchasing a Nest thermostat with our online Nest Compatibility Checker on the Google Nest support page
- The Nest Thermostat is designed to work without a C wire in most homes, but for some systems, including heating only, cooling only, zone controlled, and heat pump systems, you’ll need a C wire or other compatible power accessory
- Nest Thermostat turns itself down when you leave, so you don’t waste energy heating or cooling an empty home. Lock feature: No
- Programmable thermostat that lets you create an energy efficient schedule in the Google Home app on your Android or iPhone
- Remote control lets family members change the thermostat temperature from anywhere on a phone, laptop, or tablet[1]
3rd-generation owners
The 3rd gen is a separate model and should not be confused with the discontinued app support for the 1st and 2nd generations. If your 3rd gen works reliably, controls your HVAC properly and provides the integrations you need, there is no universal reason to replace it immediately.
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4th gen versus the cheaper Nest Thermostat
The cheaper Nest Thermostat is not simply a lower-priced version of the 4th-gen Learning Thermostat. It is a separate product with a simpler design and feature set.
| Best for | Choose |
|---|---|
| Google Home users wanting the fullest Nest feature set, broader HVAC support, room sensors and learning behavior | Nest Learning Thermostat (4th gen) |
| Buyers wanting basic smart control and scheduling at a lower cost | Nest Thermostat |
Google’s official thermostat comparison should be checked for the current feature table because software, pricing and availability can change.
Alternatives worth considering
ecobee
The ecobee Smart Thermostat Premium is a credible alternative for households that prioritize room sensors, a different ecosystem strategy or more platform flexibility. It is a poor fit for buyers specifically seeking Nest’s learning behavior, Google Home-first setup or Nest design.
The ecobee Smart Thermostat Essential targets buyers who want smart controls without paying for a premium model. Verify current prices, bundles and compatibility before purchase.
Traditional programmable thermostat
A conventional programmable thermostat remains sensible for a basic HVAC system when you do not need remote control, alerts, Matter, learning behavior or room sensors. It is generally the simplest option, but it gives up connected monitoring and smart scheduling.
Who should upgrade?
- Upgrade from a 1st or 2nd gen if you need app control, remote access or notifications after the October 2025 support cutoff and qualify for Google’s replacement offer.
- Upgrade from a 3rd gen if you need remote room sensing, Matter integration, broader staging or accessory support, or newer Google Home features.
- Keep the 3rd gen if it is reliable, your HVAC is already controlled well, you do not need Matter or sensors, and you prefer the current experience.
- Choose ecobee if room comfort and platform flexibility matter more than Google’s learning features.
- Choose a programmable thermostat if you do not need smart-home functions at all.
For homeowners planning an HVAC replacement or renovation, the thermostat should be considered alongside the equipment and control wiring—not selected in isolation. A new thermostat cannot compensate for undersized equipment, poor airflow, inadequate insulation or an incompatible control system.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
