Smart Home Starter
The Smart Home Starter team picks the products and services we write about. When you buy through our links, we may get a commission.

Does Nest Sensor Work With 2nd Generation?

Last Updated Dec 5, 2021
nest thermostat

The temperature in all the rooms in your house is not the same because of various factors, and over the years, the Google Nest thermostat has helped warm or cool rooms to the desired temperature. With the Nest Sensor, you can decide what the room’s temperature should be at a particular time of the day. But does the Nest Sensor work with 2nd Generation?

The Nest sensor only works with 3rd generation Nest Thermostat and is not compatible with 2nd generation or 1st generation Nest thermostat. 

If you want to know more about the Nest sensor and the Google Nest thermostat, this article is for you. 

What Is the Difference Between Nest 2nd and 3rd Generation?

Google acquired Nest learning thermostat in 2014, and since then, two new generations of the smart thermostat have been released. Although both the 2nd and 3rd generations retain some cool features of the 1st generation, there are some differences between them. So, what is the difference between Nest 2nd and 3rd generation? 

The presence of the Nest sensor is the significant difference between the two generations. The table below highlights the differences between Nest 2nd and 3rd generations.

Nest 2nd generationNest 3rd generation
Farsight technologyNoYes 
External temperature sensorsNoYes
Supported Wi-Fi frequenciesEnabled, 2.4GHzEnabled, 2.4GHz, 5GHz
BluetoothNoYes, BLE
Furnace heads upNoYes 
Safety alertsNoYes 
Remote sensor compatibility NoYes
Time to temperatureNoYes
Screen resolutionLCD 320 x 320, 183 ppiLCD 480 x 480 229 ppi
Weight 1.62 lbs1 lb
Product dimensions3.27 x 3.27 x 1.26 in.3.3 x 3.3 x 1.21 in.
WarrantyOne year warrantyTwo years limited


These are the standout features that make Nest 2nd generation different from 3rd generation. From the table, you can see we have some noticeable improvements, and the 3rd generation has shown to become a smarter, better, and more reliable smart thermostat.

Now that we know the differences between Nest 2nd and 3rd generation let’s look at why your Nest sensor won’t connect. 

Why Won’t My Nest Sensor Connect?

Nest sensors were introduced to help maintain a comfortable temperature in your home. The thermostat in your home can be connected to up to 6 sensors to help regulate the environment in your home to the desired temperature. But sometimes, just like any other electronics, your Nest sensor won’t connect with your thermostat.

If your Nest sensor isn’t connecting, you can troubleshoot and fix the problem yourself. If your sensor is too far from your thermostat, bringing them closer might solve the problem. You can also reset your Nest sensor to fix the connection issue. 

Connecting your Nest sensor properly can help fix the connection issue. If you would like to learn more about Nest Thermostat, check out this article.

Connecting Your Nest Sensor

To connect your Nest sensor, follow these steps:

  1. Log in to your Nest app
  2. Locate the settings icon and tap “Add Product.”
  3. A QR code is located on the sensor’s battery pull tab; scan the code to add the device to your account.
  4. To activate the sensor device itself, pull out the battery pull tab.
  5. Find a room to place the sensor. Ensure it’s a room you often visit.
  6. Name the room to something you will remember. This comes in handy when you want to use Google Assistant to adjust the temperature.

Know that sensors can’t be placed far away from the thermostat. According to Google, your sensor should be placed within 50 ft (15 m) of your thermostat. Placing it closer is even better. Connection can also be reduced by wireless interference so, ensure there is no obstacle like walls, bookshelves, and cabinets are not between the sensor and the thermostat. 

Microwave ovens, cordless phones, and other electronics can also affect connections. More solutions from google can be found here.

Can I Use Nest Thermostat as A Sensor?

Using the Nest temperature sensor, Nest thermostat regulates to a particular temperature at each time of the day, and you can’t use the Nest sensor without the thermostat. This means Nest thermostat cannot work as a sensor, and you can’t use a Nest sensor without a thermostat. 

Your Nest sensor sends temperature data directly to your thermostat in the same home and lets your thermostat regulate the temperature of each room at a certain time of the day. 

In Conclusion

The Nest sensor isn’t compatible with 2nd generation Nest thermostat. If you want to buy a smart thermostat for the first time, going for the 3rd generation Nest thermostat will be a smart move as it has more features when compared to 2nd generation. However, if you already own a 2nd generation Nest thermostat and don’t care about the new features of 3rd generation, you don’t need to upgrade.

Sign up for our newsletter
Submit
Smart Home Starter
This site is owned and operated by Time Off Club, LLC. Smarthomestarter.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. This site also participates in other affiliate programs and is compensated for referring traffic and business to these companies.