Learn about the Nest Temperature Sensor before you buy

Most homes are not the same temperature in every room. Rooms vary widely based on the number of windows, size, how much sun they get, and other factors. Your thermostat may also be in a room where you rarely spend time. The Google Nest Temperature Sensor lets you choose where your thermostat measures the temperature in your home to help keep you and your family comfortable.

Nest temperature sensor hero

We’ve worked hard to design a sensor that’s beautiful, easy to use, and helps keep you and your family comfortable.

Get to know the Nest Temperature Sensor

Why would I need a Nest Temperature Sensor? 

Google Nest thermostats come with advanced temperature sensors and algorithms built in. They’re designed to help keep you comfortable, but thermostats aren’t always installed in the best location. For instance, your thermostat might be tucked away in a closet, or mounted in a drafty hallway.

You might want a temperature sensor if you have a multi-story home and care most about your comfort downstairs during the day and upstairs at night. It might also be useful if you have a baby or elderly family member and want to ensure that the room where they spend their time is comfortable for them.

In cases where your thermostat isn’t installed in a good spot, a separate temperature sensor can help keep you more comfortable by measuring the temperature in a better location and using that temperature to tell your heating and cooling system what to do.

Do I need a Nest Temperature Sensor to use my Nest thermostat? 

No, you don’t need a temperature sensor to use your thermostat. We designed the Nest thermostat to keep you comfortable and you don’t need a separate temperature sensor to take advantage of all the energy saving features Nest thermostats have to offer.

However, if your thermostat is in an out of the way location, or if you spend a lot of time in a room other than the one your thermostat is in, a temperature sensor might help keep you more comfortable.

Can I use a Nest Temperature Sensor without a Nest thermostat? 

No, you can’t use a Nest Temperature Sensor without a Nest thermostat. Your temperature sensor will report temperature data directly to a Nest thermostat in the same home over Bluetooth.

 Compatibility 

Which Nest thermostats are compatible with the Nest Temperature Sensor?

The Nest Temperature Sensor works with the following thermostats:

  • Nest Learning Thermostat, 3rd generation
  • Nest Thermostat E

For the following countries:

  • United States
  • Canada
  • Mexico

If you’re not sure which Nest thermostat you have, see the following article:

          How to tell which Nest thermostat you have >

Important: As long as you purchased your thermostat from a retailer in one of the countries listed above, it should work with the sensor. Thermostats designed for use in other countries, however, are not currently compatible with the sensor. The app will prevent you from adding the sensor to a thermostat designed for use in any other country.

Will it work in my home? 

The Nest Temperature Sensor is battery powered so you don’t need any special wiring or an outlet to use it. It connects to your 3rd gen Nest Learning Thermostat or Nest Thermostat E over Bluetooth Low Energy and has a range of about 50 ft (15 m) so it should work in most homes.

Note: This range can be reduced based on a number of factors including the number of walls between your sensor and thermostat, the construction materials in your home, any large appliances, or competing wireless signals.

Which systems will it work with? 

The Nest Temperature Sensor works with the same systems as your thermostat, regardless of what type of system you have.

  • If you’re currently using a Nest thermostat that’s compatible with the Nest Temperature Sensor (see above), it doesn’t matter what kind of system you have. The Nest Temperature Sensor will work with it.
  • If you don’t have a Nest thermostat yet, use our compatibility checker to find out if your system will work with a Nest thermostat and the Nest Temperature Sensor.

How many can I have in my home? 

You can have up to 6 sensors for each compatible Nest thermostat in your home, up to a total of 18 sensors.

Are Nest thermostats compatible with other temperature sensors? 

Nest Thermostats are not compatible with third party sensors at this time.

 Features

How does it work? 

Everything about your system will work the same as before, except now, instead of taking the temperature reading from the thermostat, it takes the reading from the sensor.

  1. You’ll add one or more temperature sensors to the Nest app and choose a thermostat for them to report to.
  2. The sensor will tell your thermostat what temperature it is in the room where it’s placed.
  3. Whenever the sensor is active, your thermostat will use your sensor's reading to control when your system turns on and off. Your thermostat will ignore its own built-in temperature sensor during those times.

             How to set up and install your temperature sensor >

You’ll be able to choose which sensor controls your thermostat. You can:

  • Use only a Nest Temperature Sensor
  • Use only the sensors built-in to your thermostat
  • Schedule your thermostat to use different sensors at different times of the day

             How to change your temperature sensor settings >

Can I see the temperature for all my sensors? 

Yes. When you tap on a thermostat in the Nest app you’ll be able to see all the Nest Temperature Sensors that are connected to that thermostat.

You’ll also see a comparison of your sensor’s temperature reading, and the reading from your thermostat.

It will also show if your sensor is usually warmer, usually colder or about the same as your thermostat. This can help you learn a little more about your home, where you might want to move your temperature sensors, and when you want your thermostat to use them.

        Learn more about the Nest Temperature Sensor >

What kind of batteries does it use? 

A CR2 Lithium battery is included with your Nest Temperature Sensor and is also commonly available for purchase at a local store.

If you need to replace the battery, simply insert a coin into the slot on the back of your sensor and turn to unscrew the battery cover.

How long will the battery last? 

We’ve performed extensive testing on our battery life and determined that the battery in your Nest Temperature Sensor can last up to 2 years.

You’ll get a push notification on your phone and be alerted in the Nest app when the battery in a sensor is low. You’ll get another notification when your battery is critically low, so you’ll have plenty of time to change the batteries before your sensor stops working.

If you wait too long, your sensor will power down and stop reporting temperature data. It will be listed as offline in the Nest app, and you’ll need to replace the battery to get it working again.

Will the Nest Temperature Sensor help me save energy? 

The Nest Temperature Sensor is designed to keep you comfortable. Whether it results in lower or higher energy use depends on where sensors are placed, what temperature you set your thermostat to, and what temperatures are set in your schedule.

For example, during the winter when you’re heating your home:

  • If you set your thermostat to use a sensor in a well insulated bedroom that heats up quickly, your system might turn off sooner than usual and you could save energy.
  • If you set your thermostat to use a sensor in a wide open living space that heats up slowly, your system might run longer than normal and could use more energy.

             Learn more about the Nest Temperature Sensor >

Does it know what room I'm in? 

No. We designed the Nest Temperature Sensor to be really great at just one thing, measuring the temperature.

Instead of relying on motion tracking to determine which sensor your thermostat uses, you can set a schedule for your sensors. This gives you additional control over your comfort. Once your schedule is set, your thermostat will keep the rooms you want comfortable at the times you want.

 Setup and Installation

How do I set up the Nest Temperature Sensor? 

You’ll follow three simple steps to set up your temperature sensor.

  1. Get the Nest app
  2. Connect your sensor to the Nest app and link it to your thermostat
  3. Place your sensor on a flat surface or mount it on the wall

          How to set up and install your Nest Temperature Sensor >

Tip: The temperature sensor can warm up while you’re holding it. If you’ve just set up your sensor and the temperature seems a little high, wait a little bit for it to reach room temperature.

          Troubleshooting the Nest Temperature Sensor >

How do I install it? 

The Nest Temperature Sensor is wireless and easy to install. First you’ll set up your sensor with the Nest app, then you can install it in your home. You shouldn’t need anything more than a flat surface or a screwdriver.

The sensor has a rubber foot on the bottom so it will sit on a flat surface without sliding around.

There’s also an included screw if you want to mount your sensor on the wall. Simply use a screwdriver to screw it in, and attach your sensor using the screw hole on the back.

You don’t want to install your sensor too high or too low. If you normally spend all your time in a room sitting, place your sensor at about chair height. See the next question for more helpful information on where to install your sensor.

          How to install the Nest Temperature Sensor >

Where should I install it? 

For most people, it’s best to put it in a room where you spend a lot of time to help keep you comfortable. It’s best to place it at about chest height so it can accurately measure the temperature.

It will need to be within 50 feet (15 m) of your thermostat, so they can communicate. The wireless range can be reduced by walls, floors, appliances, furniture and other electronics. So you may need to place them closer together.

To learn more, see the following article:

         Where to install your Nest Temperature Sensor >

Where should it not be installed? 

The sensor is not designed for outdoor use, and you should not place it in an uninsulated room like an attic or basement.

To learn more, see the following article:

         Where not to install your Nest Temperature Sensor >

Important: Do not paint or cover your Nest Temperature Sensor.

Can I hide or cover my Nest Temperature Sensor? 

We worked to design a temperature sensor that blends in to your home’s surroundings.

If you want to make your temperature sensor less visible, here are a few things to keep in mind:

  • If you hide your temperature sensor behind something in your home, make sure it has good airflow or it won’t be able to accurately measure the temperature in the room.
  • Don’t completely cover the sensor, block airflow, or place it somewhere that’s exposed to a source of heating or cooling like a fireplace.

Important: Do not paint your Nest Temperature Sensor.

        Where to not install your Nest Temperature Sensor >

Using your Nest Temperature Sensor 

Can I schedule my thermostat to use sensors at different times? 

Yes. You can set a schedule to have your thermostat use a different sensor at different times of the day. For each thermostat you can select which temperature sensor you’d like to use in the Morning, at Midday, in the Evening, and at Night.

For example, you can have your thermostat use your bedroom sensor during the Night and Morning, and use your living room sensor during the Midday and Evening.

Nest temperature home animation image.

Here are what the times mean:

Morning: 7am to 11am
Midday: 11am to 4pm
Evening: 4pm to 9pm
Night: 9pm to 7am

          How to set a schedule for your temperature sensors >

Can I set two or more rooms to different temperatures at the same time? 

No, you won’t be able to do this without a zoned system or special vents installed in your home.

The way single zone systems work, they turn on and heat or cool all parts of your home at the same time. This means that you won’t be able to stop heating one room, and continue to heat another. In most homes, all the rooms will continue to heat or cool until your system shuts off.

Even though you can attach up to 6 sensors per thermostat, your thermostat can only use one at a time. Nest Temperature Sensors let you choose which room in your house is most important, or set a schedule so your thermostat will use different sensors at different times. Your thermostat will then use the sensor you chose to work to keep your home comfortable.

If you have a zoned system

If you have a zoned system with multiple thermostats, you can use up to six Nest Temperature Sensors for each thermostat.

          How to set a schedule for your temperature sensors >

Why are different rooms different temperatures? 

There are a lot of reasons why different rooms, or even two sensors in the same room, might show different temperatures in the Nest app.

Some rooms are large and take longer to heat up or cool down. Rooms with lots of windows may lose heat more quickly in the winter, or heat up more quickly if the sun is shining. Even something as simple as closing a hallway door can keep air from circulating and cause a temperature difference.

You’ll be able to see in the Nest app if one of your sensors has a temperature that’s significantly different from your other sensors. That way you’ll be able to tell which temperature sensor to use at what time to keep you the most comfortable.

        Learn more about temperature sensors and heating your home >

Does it track humidity? 

No. We designed the Nest Temperature Sensor to be really great at just one thing, measuring the temperature.

 

 Safety and Security

What if my Wi-Fi goes down? 

Nest Temperature Sensors are battery powered and will keep working even if your home’s Wi-Fi goes out. The temperature sensor talks directly to your Nest thermostat over Bluetooth so it doesn’t need Wi-Fi.

When Wi-Fi goes down, your thermostat will lose its connection with the Nest app so you won’t be able to control it with the app until it comes back online. But you’ll always be able to adjust the temperature by turning the ring on your thermostat.

If your temperature sensor fails to report data for more than 10 minutes, your thermostat will default to its built-in temperature sensors. If your sensor fails to report data for an extended period of time, you’ll get a notification on your phone. You may need to move your temperature sensor closer to your thermostat to bring it back online.

            Troubleshooting the Nest Temperature Sensor >

Can someone hack my temperature sensor? 

We take data security very seriously and work hard to make sure that your personal information is not compromised.

It’s important that any data we transmit remains secure, even the temperature data in your home. Data is encrypted and transmitted over Bluetooth directly from your temperature sensor to your thermostat.

Information from your thermostat is transmitted to Nest servers using secure AES 128-bit encryption to help keep your data safe.

Is there a warranty? 

Yes, Nest Temperature Sensors have a 1 year warranty.

What is Nest's privacy policy? 

At Nest, we take your privacy seriously. Learn more about our privacy practices at the following link:

          Privacy statement for Nest products and services >

Purchasing and ordering 

Is there a monthly fee? 

No. There are no additional fees to use your thermostat or your temperature sensors.

In what countries can I use it? 

The Nest Temperature Sensor is currently compatible with thermostats designed for use in one of the following countries:

  • United States
  • Canada
  • Mexico

Important: As long as you purchased a compatible thermostat from a retailer in one of the countries listed above, it should work with the sensor. Thermostats designed for use in other countries, however, are not currently compatible with the sensor. The app will prevent you from adding the sensor to a thermostat designed for use in any other country.

For the latest information about where you can buy Nest products, see the following page:

         Countries where Nest products are available for purchase >

Where can I buy the Nest Temperature Sensor? 

You can see pricing and purchase the Nest Temperature Sensor at store.google.com.

Tip: Check before visiting one of our retail partners to see which Nest products they carry.

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