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Verdict: The Nest Learning Thermostat (4th gen) is an excellent premium thermostat for Google Home households. Its dramatically larger display, polished redesign, included second-generation room sensor, broader HVAC support, and Matter compatibility make it a meaningful redesign—not just a cosmetic refresh. But at a U.S. launch price of $279.99, it is expensive, and its energy savings are too dependent on your home, equipment, climate, and habits to justify the cost for everyone.
Buy it if design, Google integration, automatic scheduling, and solving hot or cold rooms matter more than price. Compare alternatives if you want true room-by-room zoning, broader platform independence, or a lower installed cost. Most importantly, check HVAC compatibility before buying.
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Price and what you get
The Nest Learning Thermostat (4th gen) launched in the United States with a $279.99 MSRP reference. That places it near the premium end of consumer smart thermostats. Check the Google Store product page for current pricing, promotions, installation options, and availability.
The box includes the thermostat, mounting hardware, labels, documentation, a new backplate, an optional trim kit, and one Nest Temperature Sensor (2nd gen). The sensor matters because comparable room-sensing functionality may require an additional purchase on some competing thermostats.
#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
Budget separately for installation if you hire a professional. A historical review-period quote of about $435 for professional installation is not a universal or current price. Local labor, system complexity, and region can change the total substantially. The thermostat may also qualify for a utility rebate, but eligibility is location- and program-specific; verify it at Google’s rebates page or with your utility before counting it as a discount.
The design is the strongest upgrade
The fourth-generation model is visibly more useful than its predecessor. Google says its display is 60% larger than the third-generation model, and the effect is obvious from across a room. The circular 600 × 600 LCD measures approximately 2.7 inches across, inside a thermostat measuring 3.9 inches in diameter.
Available finishes are Polished Silver, Polished Obsidian, and Polished Gold. The display shows temperature clearly and adds visual status information, weather-related details, and motion-activated information. Its polished-metal appearance makes it look more like a deliberate piece of interior hardware than a utilitarian wall control.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteAccording to Google’s professional information sheet, the display is approximately 1.1 inches deep and weighs about 5.7 ounces; the assembled unit is approximately 1.2 inches deep and 6.9 ounces. The included trim kit can cover wall marks, paint gaps, or an electrical box.
Whether that redesign is worth the premium is subjective, but it is the part you experience every day. Energy savings may be modest or difficult to isolate; the larger, more attractive display is an immediate improvement.
What is new in the fourth generation?
- 60% larger display: A 600 × 600 circular LCD makes readings easier to see.
- Redesigned hardware: New finishes, backplate, and trim kit create a more polished installation.
- Included second-generation sensor: Useful for prioritizing a bedroom, nursery, office, or other room.
- Matter certification: Basic thermostat control can work through a Matter-compatible smart-home app.
- Smarter energy features: Adaptive Eco, Smart Schedule suggestions, natural heating and cooling, and smart ventilation where supported.
- Broader HVAC support: The model supports more configurations, including certain ventilation, humidification, dehumidification, and dual-transformer installations.
- HVAC health alerts: The system can provide informational warnings about possible equipment issues, subject to eligibility and availability.
The thermostat connects over 2.4GHz and 5GHz 802.11n Wi-Fi and Bluetooth Low Energy. It also includes Soli motion sensing, temperature and humidity sensors, and an ambient-light sensor. Google lists the unit as ENERGY STAR certified.
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
How useful is the included room sensor?
A wall thermostat often measures a hallway, foyer, or another location that does not reflect where people spend time. The included sensor lets the system use the temperature in a more relevant room—for example, a bedroom at night or an office during the workday.
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Google says the fourth-generation thermostat supports up to six temperature sensors per thermostat. Multiple sensors can contribute to an average across rooms, depending on how the system is configured.
The second-generation sensor uses a replaceable CR2 3V lithium battery, is intended for indoor use, and has an operating range of 32°–104°F. Its specifications are listed in Google’s sensor specification sheet.
However, this is not independent zoning. The sensor changes the temperature measurement the thermostat uses; it does not give each room its own furnace, air conditioner, or separate heating and cooling schedule. It also cannot fix poor insulation, blocked vents, inadequate ductwork, or an HVAC system that is too small for the home.
Place the sensor away from direct sunlight, windows, exterior walls, appliances, and supply vents. A poorly positioned sensor can create a less representative reading than the thermostat itself.
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The fourth-generation Nest retains the learning concept: it observes temperature adjustments and occupancy patterns, then helps build an automatic schedule. The process is more visible than it was on earlier models because Smart Schedule can suggest changes that you can accept or reject.
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
Adaptive Eco is designed to adjust behavior when the home is unoccupied. Natural heating and cooling can make more context-aware adjustments, while smart ventilation can control compatible ventilation equipment. Outdoor conditions and weather information can inform some of these behaviors.
These features are intended to reduce unnecessary heating and cooling, but there is no responsible universal energy-savings percentage. Results depend on your existing schedule, insulation, equipment efficiency, occupancy, climate, and utility rates. A household already using an efficient schedule may see a smaller improvement than someone who leaves heating or cooling running unnecessarily.
The “AI” label is less important than the actual functions. The practical changes are schedule recommendations, adaptive away behavior, weather-informed adjustments, and contextual alerts—not proof that every home will be more comfortable or cheaper to heat.
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The fourth-generation Learning Thermostat uses the Google Home app for installation and primary control. It is not managed like the third-generation Learning Thermostat through the legacy Nest app. Google’s product documentation states that setup requires Google Home.
This is a significant consideration for existing Nest owners who prefer the old app, households trying to reduce dependence on Google services, or buyers expecting a direct one-for-one replacement.
Google Home also means the thermostat’s advanced functions are tied to a cloud-connected platform. That provides remote access and richer automation, but it is not the same as owning a fully local, platform-independent thermostat.
Rank #4
- Professional installation Recommended! Advanced Compatibility & Performance: Works with most 24V systems, including gas, electric, oil, forced air, heat pump, radiant heating, dual-fuel systems, geothermal systems, and zoned HVAC systems, with professional calibration for maximum efficiency.
- Optimized for Professional Installation: Designed for seamless integration by certified installers, ensuring proper configuration and peak performance for your heating and cooling systems.
- Enhanced Energy-Saving Features: Includes the Nest Temperature Sensor for precise room-based temperature control, with professional tuning to minimize energy waste and adapt to your specific system needs.
- Premium Support Services: Access to specialized customer support, ensuring smooth operation and rapid troubleshooting tailored to professionally installed devices.
What Matter support does—and does not—do
Matter broadens the thermostat’s interoperability. Google says the fourth-generation model can be controlled through Google Home or a Matter-compatible app of the user’s choice.
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That should not be confused with complete feature parity. Matter can provide standardized controls such as temperature and operating mode, while Nest-specific functions—including learning, Adaptive Eco, sensor management, schedule intelligence, and energy reporting—may still depend on Google Home. Matter improves flexibility, but it does not reproduce every Nest feature in every Apple Home, Alexa, or other Matter ecosystem.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Installation: easy only after compatibility is confirmed
Google positions installation as a do-it-yourself process with step-by-step instructions in Google Home. That may be realistic for a straightforward 24-volt system, but “easy installation” should not be treated as a guarantee.
Turn off HVAC power before touching wiring. Photograph the existing terminals, label wires by terminal—not merely by color—and identify the system type before removing the old thermostat. The fourth-generation Nest has a new backplate, so an existing third-generation installation should not be assumed to be plug-and-play. You may need to remove the old plate, drill new holes, use the trim kit, and configure the equipment again in Google Home.
Does it need a C wire?
Usually not, but not universally. Google’s Power Sharing design allows the thermostat to work without a C wire in most homes. If the HVAC system cannot provide enough power, however, the thermostat may report a power issue and require a C wire or a Nest Power Connector.
Google specifically identifies some heating-only, cooling-only, zone-controlled, and heat-pump systems as situations where a C wire or Nest Power Connector may be needed. Do not buy based only on the presence of a blue wire. The terminal connections and equipment type are what matter.
Best Value
- 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]
Supported HVAC systems
Google lists support for most 24-volt:
- Gas, electric, and oil systems
- Forced-air, radiant, and hot-water systems
- Heat pumps, including auxiliary and emergency heat
- One-, two-, and three-stage heating
- One- and two-stage cooling
- Solar and geothermal systems
- Certain humidifier, dehumidifier, ERV, HRV, supply-only, and exhaust ventilation systems
- Dual-transformer systems
The major warning is proprietary communicating HVAC equipment. Heat pumps and other systems that use a closed manufacturer-specific protocol may not be compatible. Zone controls, dual-fuel systems, multi-stage equipment, ventilation accessories, and unusual terminal arrangements deserve particular care.
Use Google’s compatibility information before purchase. If the wiring or equipment is unclear, have an HVAC professional identify the system rather than guessing from the old thermostat’s appearance.
Fourth-generation versus third-generation Nest
| Feature | Nest Learning Thermostat (4th gen) | Nest Learning Thermostat (3rd gen) |
|---|---|---|
| Display | Approximately 60% larger; 600 × 600 circular LCD | Smaller previous-generation display |
| Room sensor | One second-generation sensor included | No equivalent sensor included in the standard package |
| App | Google Home required | Legacy Nest app ecosystem |
| Backplate | New backplate; not assumed to be a drop-in replacement | Original third-generation mounting system |
| Smart-home standard | Matter certified | Older platform support |
| HVAC support | Expanded support for certain ventilation and accessory configurations | More limited than the newer model in some configurations |
| Automation | Smart Schedule suggestions, Adaptive Eco, natural heating and cooling, and smart ventilation where compatible | Learning schedules and established Nest automation |
| Value | Best when the display, sensor, compatibility, and Matter support have practical value | Worth keeping if it works reliably and already meets your needs |
Upgrade from the third-generation model if you have hot or cold rooms, want the larger display, need newer HVAC or Matter support, or are replacing an unreliable thermostat anyway. Keep the third-generation model if it works well, your temperatures are balanced, you prefer the Nest app, and the new price would buy little practical improvement.
Alternatives worth considering
- ecobee Smart Thermostats: A strong choice for buyers who prioritize room sensors, broader smart-home integration, or ecobee’s ecosystem. Compare included sensors, total price, HVAC compatibility, and any subscription-dependent features at purchase.
- Amazon Smart Thermostat: A lower-cost option for Alexa-centered homes, but it does not offer the Nest’s premium display or included room-sensor package.
- Honeywell Home T9: Worth considering for remote sensors and Resideo/Honeywell Home integration. See the official product page.
- Sensi: A budget-focused option for app control and programmable scheduling. It is less suited to buyers seeking a premium display, built-in learning, advanced room balancing, or Matter interoperability. See Sensi’s official store.
Who should buy the Nest Learning Thermostat (4th gen)?
Buy it if the thermostat is in a poor representative location, you want to prioritize a bedroom or office, you use Google Home, design matters, you need broader modern HVAC support, or a rebate substantially reduces the cost.
Compare alternatives if you want the lowest purchase price, true independent room-by-room control, a non-Google setup, or a platform where every advanced feature works outside Google Home.
Do not buy before checking compatibility if you have a proprietary communicating system, unusual heat pump, dual-fuel or multi-stage equipment, ventilation accessories, zone controls, or no C wire and an uncertain power situation.
Google lists a two-year limited device warranty in its professional information sheet and a five-year limited warranty for Nest Pro installation, subject to Google’s terms. The latter is not the standard warranty for every installation.
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.
