Google ended support for its 1st- and 2nd-generation Nest Learning Thermostats on October 25, 2025. The affected thermostats lost access to the Nest and Google Home apps, remote control, notifications, voice assistants, Home/Away Assist, and other cloud features. They were not necessarily rendered useless: Google says owners can still adjust them locally and use schedules stored on the device.
Which Nest thermostats are affected?
Google’s support change applies specifically to these models:
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| Thermostat | Status after October 25, 2025 |
|---|---|
| Nest Learning Thermostat, 1st generation, released in 2011 | Support ended |
| Nest Learning Thermostat, 2nd generation, released in 2012 | Support ended |
| Nest Learning Thermostat, 2nd-generation European version, released in 2014 | Support ended |
| Nest Learning Thermostat, 3rd generation | Not included in this specific cutoff |
| Nest Thermostat E | Not included in this specific cutoff |
| Nest Thermostat, 2020 | Not included in this specific cutoff |
| Nest Learning Thermostat, 4th generation | Not included in this specific cutoff |
This does not mean that every older Nest thermostat has lost support. The official notice names the three early Learning Thermostat versions above. Use Google’s model-identification guide rather than relying on appearance alone.
What stopped working?
After the cutoff, affected thermostats no longer work as connected Nest devices. Google says they were removed from the Nest and Google Home apps and no longer support:
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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]
- Temperature changes and monitoring from a phone or tablet
- Thermostat notifications
- Third-party voice assistants and other connected services
- Home/Away Assist
- Multi-device Eco mode control
- The thermostat-related Nest Protect emergency shutoff feature
- Software and security updates
In practical terms, the cloud connection is gone. If you used the app to change the temperature while away, receive alerts, or automate the thermostat with other smart-home devices, those features are no longer available on an affected model.
What still works?
The thermostat itself can still provide basic local control. Google says owners can use the device to:
- Adjust the temperature
- Switch between available temperature modes
- Change device settings
- Manage auto-schedule settings
- Continue using schedules already stored on the thermostat
The simplest way to understand the change is that the thermostat can continue operating as a local, largely conventional thermostat, but it is no longer a connected Nest device. Continued operation still depends on the physical thermostat, its wiring, the HVAC equipment, and the settings stored on it. Performance may decline over time because the device no longer receives software or security updates.
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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 to check whether your thermostat is affected
- Open the Google Nest or Google Home app if the thermostat is still listed.
- Open the thermostat’s information or settings screen.
- Check the model name, serial number, and software information.
- Compare the result with Google’s “How to tell which Nest thermostat you have” guide.
If it has already disappeared from the app, inspect the display, outer ring, base, and model markings. Do not treat a firmware number alone as a definitive identification test; Google’s guidance emphasizes the model and device-information details.
Do you need to replace the thermostat?
No—not automatically. You may be able to keep using the old thermostat if you are comfortable adjusting it locally, its stored schedule is sufficient, and you do not need remote access, notifications, voice control, or smart-home automation.
Replacement makes more sense if you rely on:
- Remote temperature changes
- Vacation or second-home monitoring
- Temperature and equipment notifications
- Home/Away routines
- Voice control
- Nest Protect integration
- Ongoing security and manufacturer support
Your replacement options
Stay with Google Nest
The most direct upgrade is the Nest Learning Thermostat, 4th generation. Google also offers the 2020 Nest Thermostat for compatible, less complex installations. Check the exact app requirements before buying: Google says the 4th-generation Learning Thermostat and 2020 Nest Thermostat use the Google Home app, while the 3rd-generation Learning Thermostat and Nest Thermostat E use the Nest app after account migration. Details are available in Google’s Nest app and Google Home app documentation.
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
Google’s affected-owner offer for the 4th-generation model was listed at $149.99 in the United States and CA$219.99 in Canada, but it was an eligibility-based promotion tied to unique links and expired on December 31, 2025. It should not be treated as a current universal price or discount.
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ecobee may suit households that want room sensors or a different smart-home platform. The Amazon Smart Thermostat may be more appropriate for Alexa- and Ring-focused homes. Neither is universally better than Nest. Compare the specific model’s HVAC compatibility, power requirements, platform support, sensor features, subscription policies, and availability in your region.
Official starting points include ecobee’s smart thermostat range and the Amazon thermostat marketplace. Verify compatibility with the manufacturer before purchasing.
Rank #4
- ENERGY STAR certified smart thermostat for home that helps you save energy and stay comfortable.Control the temperature with your voice using smart home devices that work with Google Assistant or Alexa[3]Nest Renew makes it simple to support clean energy right from home; it works with your Nest Thermostat[5] to help you automatically prioritize your usage[6] to times when energy is cleaner or less expensive.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. You can control your Nest Thermostat manually when there's no internet connection.
- Nest Thermostat turns itself down when you leave, so you don’t waste energy heating or cooling an empty home
- 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]. | Control the temperature with your voice using smart home devices that work with Google Assistant or Alexa[3].
Install a conventional programmable thermostat
If you only need local scheduling, a conventional programmable thermostat can avoid dependence on an account or cloud service. The trade-off is losing app control, voice commands, remote monitoring, and smart automation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check HVAC compatibility before buying
The support change affects the thermostat’s software and cloud services—not the furnace, air conditioner, heat pump, or boiler. Replacing the thermostat does not necessarily mean replacing the HVAC system, but compatibility must be checked before any wires are moved.
Depending on the installation, a replacement may require:
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- ENERGY STAR certified smart thermostat for home that helps you save energy and stay comfortable.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.Connectivity Protocol : Wi-Fi.Connectivity Protocol : Wi-Fi
- 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. Lock feature: No
- Nest Thermostat turns itself down when you leave, so you don’t waste energy heating or cooling an empty home; easily program 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]
- Savings Finder looks for more ways your thermostat can help you save, and suggests tweaks to your schedule in the app; check with your energy provider to learn more about rebates and more ways to save on a Nest thermostat
- A C wire or a compatible power accessory such as the Nest Power Connector
- Different wiring for a heat pump or dual-fuel system
- Support for multiple transformer circuits or multiple R wires
- Controls for humidification, dehumidification, ventilation, or hot water
- A professional installer for proprietary or complex equipment
Google’s compatibility guide explains common 24-volt systems and situations where a C wire, Nest Power Connector, or professional installation may be needed. Incorrect wiring or installation settings can damage the thermostat or HVAC equipment.
When professional installation is the safer choice
Arrange professional help if your system uses dual fuel, a heat pump with auxiliary or emergency heat, multiple transformers, humidification or dehumidification equipment, ventilation controls, hot-water controls, proprietary wiring, or an equipment-interface module. Professional installation is also sensible if you are unsure which wires control the system or cannot safely identify the HVAC configuration.
European owners should take extra care. The affected European model is included in Google’s notice, but European boilers, hot-water programmers, and heating controls may use wiring and control schemes that differ substantially from common US 24-volt forced-air systems. Google provides separate guidance for European hot-water-programmer installations.
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Common mistakes to avoid
- Assuming the thermostat is completely dead: local temperature control and stored schedules may still work.
- Assuming every old Nest is affected: the cutoff specifically covers the listed 1st- and 2nd-generation Learning Thermostats.
- Buying before checking wiring: the replacement may need a C wire, power connector, adapter, or professional installation.
- Expecting Nest Protect integration to remain: Google says the affected thermostat disconnects from Nest Protect and its thermostat-related emergency shutoff no longer runs.
- Treating the expired discount as current: the affected-owner promotion ended December 31, 2025.
- Assuming a thermostat fixes an HVAC problem: a replacement cannot correct defective wiring, a failing furnace, or an incompatible control board.
Bottom line for affected owners
The early Nest thermostats were not universally “bricked” on October 25, 2025. They lost their apps, cloud services, remote features, integrations, and updates, while Google says local controls and stored schedules can continue working. Keep the thermostat if that limited operation meets your needs. Replace it when remote access, automation, notifications, smart-home integration, or supported security updates matter—and verify the HVAC wiring and equipment before choosing a replacement.
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