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If you own a first-generation Nest Learning Thermostat, second-generation Nest Learning Thermostat, or European second-generation model, Google ended its connected support on October 25, 2025. The thermostat was not physically disabled: it can still control heating and cooling from the wall, and existing schedules continue to run. However, the Nest and Google Home apps, remote adjustments, notifications, Google Assistant control, Home/Away Assist, and other cloud-dependent features no longer work for those three models.
This is not a shutdown of every old Nest thermostat. The third-generation Nest Learning Thermostat, its European version, the Nest Thermostat E, the 2020 Nest Thermostat, and the fourth-generation Nest Learning Thermostat were not included in this cutoff.
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Which Nest thermostats lost connected support?
Google’s October 25, 2025 cutoff applies specifically to these models:
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| Model | Original release | What changed after October 25, 2025? |
|---|---|---|
| Nest Learning Thermostat, 1st generation | 2011 | Removed from the Nest or Google Home app; connected features ended. |
| Nest Learning Thermostat, 2nd generation | 2012 | Removed from the Nest or Google Home app; connected features ended. |
| Nest Learning Thermostat, 2nd generation, European version | 2014 | Removed from the Nest or Google Home app; connected features ended. |
The phrase “old Nest thermostat” is too broad to be useful. A third-generation Learning Thermostat is not affected by this particular end date, and neither are the Nest Thermostat E, 2020 Nest Thermostat, or fourth-generation Learning Thermostat. Those products remain on their respective support paths according to Google’s announcement.
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- 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]
What still works on an affected thermostat?
Google has not described these units as being physically bricked. You can still use the thermostat itself to perform functions available through its local interface, including:
- Adjusting the target temperature from the wall unit.
- Switching between available heating, cooling, and off modes.
- Managing auto-schedule settings available on the device.
- Changing other settings that the thermostat exposes locally.
- Following existing temperature schedules.
Existing schedules are expected to continue operating without interruption. The important distinction is between local thermostat control and cloud-connected control: the first remains available, while the second has ended for the affected models.
What stopped working?
After the cutoff, affected thermostats were unpaired and removed from the Nest or Google Home app. Owners lost the ability to use a phone or tablet for the following functions:
- Checking the thermostat’s status remotely.
- Changing the temperature remotely.
- Changing settings from the Nest or Google Home app.
- Receiving supported notifications.
- Controlling the thermostat with Google Assistant.
- Using Home/Away Assist and related automatic behavior.
- Using other features that depend on Google’s servers or app integration.
Nest Protect integration also disconnected, including the associated emergency shutoff function. Google says the affected thermostats no longer receive software or security updates, although they continue to report diagnostic logs.
That makes the end of support more significant than simply losing a convenient phone app. The thermostat may continue to heat or cool the building, but it has lost cloud features, security maintenance, and integrations that were part of the product’s original value.
How to identify your Nest model before replacing it
Do not buy a replacement based only on the thermostat’s appearance. Nest generations can look similar, and the support outcome depends on the exact model.
- Check the thermostat and its information screens. Open the device’s settings or technical information area and look for model details.
- Check the Nest or Google Home app if the thermostat is still listed. The product information may identify the model or generation.
- Use Google’s model-identification guide. Compare the device, display, base, and identifying numbers with Google’s official guide.
- Record the HVAC wiring before removing anything. Take a clear photograph of the connected wires and their terminal labels. This is useful whether you install the replacement yourself or hire an HVAC professional.
If the thermostat is a third-generation Learning Thermostat or one of the other unaffected models, the October 25, 2025 cutoff does not by itself require replacement. A separate problem—such as a failed display, wiring issue, or discontinued feature—should be diagnosed independently.
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Google identified the Nest Learning Thermostat 4th gen as the principal replacement for eligible U.S. owners. The personalized replacement promotion was listed at $149.99 on Google’s support page, while Google’s community announcement described it as $130 off a $279.99 MSRP. That offer was limited by household and device count and expired on December 31, 2025. It should not be treated as an available discount in August 2026.
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- Create comfort zones throughout your home by connecting to select Alexa devices to automatically adjust heating and cooling based on temperature readings or presence detection.
- Save money and energy - After purchase, Amazon will send you an email with details about home thermostat rebates that may be available from energy providers in your area.
- Save energy - According to EPA estimates, ENERGY STAR certified thermostats save an average of $90 on yearly energy bills.
- Programmable thermostat and automatic control - Create your own home, away and sleep schedules, or have Alexa automatically control the temperature with Alexa+ advanced features.
Google’s U.S. Store listing recorded the fourth-generation model at $279.99 at the time of the supplied research. Pricing, availability, and promotions can change, so check the current listing before budgeting for the project.
The fourth-generation model includes one temperature sensor, uses the Google Home app for setup and control, is Matter-certified, and is designed for most 24-volt HVAC systems. It is a sensible first replacement to investigate for an affected U.S. installation, but it is not automatically a drop-in replacement.
Before purchasing, verify the system with Google’s compatibility checker. System type, number of heating and cooling stages, heat-pump configuration, zone controls, ventilation equipment, and available wiring can all affect compatibility. Google says some heating-only, cooling-only, zone-controlled, and heat-pump systems require a C wire or a Nest Power Connector.
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A thermostat is a control device connected to the HVAC system, not merely a wall-mounted display. Replacing one can expose issues that are easy to miss from the front of the old unit:
- Wiring: The existing cable may not contain the conductors the new thermostat needs.
- Power: Some systems need a C wire or an approved power accessory for reliable operation.
- System type: Heat pumps, multi-stage equipment, dual-fuel systems, and zone-controlled systems require careful configuration.
- Accessory controls: Humidifiers, dehumidifiers, ventilators, and other equipment may use terminals or control logic that differ between models.
- Backplate and wall repairs: The new thermostat may use a redesigned backplate, leaving old screw holes, paint lines, or an opening that needs patching.
- Commissioning: A thermostat can appear powered while still being configured incorrectly for the equipment it controls.
Google describes the fourth-generation thermostat as supporting broader ventilation, humidifier, and dehumidifier configurations than earlier models. That does not mean every existing installation is compatible. Use the compatibility check, follow the manufacturer’s wiring instructions, and bring in an HVAC professional when the system type or wiring is uncertain.
When an additional Nest temperature sensor is useful
The fourth-generation Learning Thermostat includes one temperature sensor. An additional Nest Temperature Sensor 2nd gen may help if the thermostat is installed in a hallway or another location that does not represent the temperature in an occupied bedroom, office, nursery, or problem room.
A sensor can improve room-by-room temperature management, but it does not create separate heating zones by itself. The HVAC system still determines which areas receive conditioned air. Before buying an extra sensor, confirm that the thermostat model supports it and investigate airflow, insulation, balancing, and zoning issues that may be causing the hot or cold room.
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When a Nest Power Connector may be needed
The Nest Power Connector is relevant only to installations whose wiring and HVAC configuration require it. It is not a universal add-on or a substitute for understanding the system.
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- Automatically adjusts to your set schedule to save energy when you’re gone and optimize comfort when you’re home. Keep track of your energy consumption when you're on the go on the ecobee app
- Easy DIY install. No C Wire, no problem. Get the ecobee Power Extender Kit (PEK) for homes without a C-Wire and keep your walls looking nice with our trim kit – both sold separately
Check the compatibility result and installation instructions before ordering one. A professional should evaluate the installation if you have a heat pump, multiple stages, zone control, unusual wiring, no clearly identified common wire, or equipment such as a humidifier or dehumidifier. Turn off HVAC power at the appropriate electrical disconnect or breaker before any wiring work, and never rely on the thermostat display alone to confirm that the circuit is safe.
Europe: a different replacement path
The U.S. replacement offer does not automatically apply to Europe. Google announced that it would not launch new Nest thermostats in Europe going forward because European heating systems have varied hardware and software requirements.
Google said the third-generation Nest Learning Thermostat and Nest Thermostat E would continue to be sold in Europe while supplies lasted and would continue receiving security updates and app control under that announcement. For affected European second-generation owners, Google identified the tado Smart Thermostat X Starter Kit as the promotional replacement path rather than the U.S. fourth-generation offer.
European owners should verify local availability, radiator or boiler compatibility, installer requirements, and current promotional terms. A thermostat designed for a North American 24-volt system should not be assumed to work with a European boiler or heating installation.
Alternatives to the fourth-generation Nest
If you no longer want to depend on Google’s smart-home platform, an ecobee smart thermostat is a legitimate alternative to investigate. ecobee provides an official compatibility checker and markets thermostats for a broad range of homes, but “compatible with most homes” is not the same as compatible with every HVAC system. Check the exact model against your wiring and equipment before ordering.
Other alternatives may also be available by region, but the selection should be based on the HVAC system first and app preferences second. For a construction, remodel, or rental-property project, also consider:
- Whether the owner wants a cloud-connected device at all.
- Whether the system should remain controllable locally if internet service or a vendor account is unavailable.
- How long the manufacturer commits to security updates and app support.
- Whether replacement parts, sensors, and installers are readily available in the project’s region.
- Whether the thermostat can integrate with the property’s existing home-automation platform.
A practical replacement checklist
- Confirm the model. Determine whether the thermostat is one of the three affected generations.
- Test local operation. Confirm that the unit can still call for heating or cooling and that its schedule is behaving as expected.
- Document the system. Photograph the wiring, record terminal labels, and identify the HVAC equipment and any accessories.
- Run a compatibility check. Use the manufacturer’s checker for the exact replacement model—not just the brand.
- Decide whether to stay with Google. Compare the fourth-generation Nest with an ecobee or a regionally appropriate alternative.
- Price the full job. Include the thermostat, any required power accessory, additional sensors, wall repairs, and professional installation if needed.
- Install and commission carefully. Verify heating, cooling, fan operation, equipment stages, schedules, remote access, and any accessory controls.
- Keep the old thermostat until testing is complete. If it is removed, label and preserve the wiring information rather than discarding it immediately.
Should you replace an affected Nest immediately?
There is no single answer for every property. If local control and the existing schedule are sufficient, the thermostat may continue serving as a basic wall controller. However, replacement becomes more urgent when the property depends on remote monitoring, tenant or vacation-home access, notifications, Google Assistant, Home/Away behavior, Nest Protect integration, or current security updates.
For a remodel or new installation, the end of support is also a reason to review the smart-home specification rather than automatically reinstalling a decade-old connected device. Select equipment with a verified wiring match, a clear support policy, and a fallback method of local control where practical.
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- PRIVACY PROTECTION: Sensi won’t sell your personal information to third parties or leverage your thermostat activity data for targeting or advertising purposes
- CONTROL FROM ANYWHERE: The top-rated mobile app for Android and iOS devices makes it easy to control your comfort from a smartphone or tablet
What this means for owners of unaffected models
Owners of the Nest Learning Thermostat 3rd gen, European 3rd gen, Nest Thermostat E, European Nest Thermostat E, 2020 Nest Thermostat, and Nest Learning Thermostat 4th gen do not need to replace the device solely because of this October 2025 announcement. Their support status is different from that of the three affected models.
That does not guarantee indefinite support. Smart thermostats depend partly on manufacturer software, accounts, apps, and servers. The broader lesson is to distinguish a product’s physical life from its connected-service life and to keep a plan for local HVAC control if cloud features are important to the property.
Frequently Asked Questions
Did Google shut off all old Nest thermostats?
No. The October 25, 2025 cutoff applies to the first-generation Nest Learning Thermostat, second-generation Nest Learning Thermostat, and European second-generation model. The third-generation Learning Thermostat, Nest Thermostat E, 2020 Nest Thermostat, and fourth-generation Learning Thermostat were not included in this specific action.
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Yes. Google says affected units can still be adjusted locally, switch modes, manage available settings, and follow existing schedules. App control, notifications, Google Assistant, Home/Away Assist, Nest Protect integration, and other connected features ended.
Is Google’s $149.99 replacement offer still available?
No. The personalized U.S. offer for the fourth-generation Nest Learning Thermostat expired on December 31, 2025. Do not assume that price is available in 2026.
Is the Nest Learning Thermostat 4th gen a drop-in replacement?
Not necessarily. Compatibility depends on the HVAC system, stages, zones, accessories, and wiring. Some systems require a C wire or Nest Power Connector. Use Google’s compatibility checker before purchase or installation.
Do European owners receive the U.S. fourth-generation Nest replacement offer?
The U.S. offer should not be generalized to Europe. Google identified the tado Smart Thermostat X Starter Kit as the European promotional replacement path and separately explained that it would not launch new Nest thermostats in Europe going forward.
The Bottom Line
Bottom line: Google ended connected support—not basic physical operation—for three decade-old Nest Learning Thermostat models on October 25, 2025. Identify the exact model first, then check HVAC compatibility before choosing a replacement. For U.S. owners, the fourth-generation Nest is the obvious Google replacement, but its former $149.99 offer has expired and installation is not guaranteed to be plug-and-play. European owners need a region-appropriate solution, including the tado path Google identified in its announcement.
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