Nest Protect Smoke & Carbon Monoxide Alarm, 3-Pack

Last updated date: October 14, 2020

DWYM Score

9.5

Nest Protect Smoke & Carbon Monoxide Alarm, 3-Pack

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We looked at the top Smoke Detectors and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Smoke Detector you should buy.

Editor's Note October 14, 2020:
Checkout The Best Smoke Detector for a detailed review of all the top smoke detectors.

Overall Take

This easy-to-install smoke detector will alert you to both smoke and carbon monoxide in your home. This smart detector offers a combination of voice, siren and smartphone alerts. It can notify you of dangers whether you are asleep in bed or away from home. The smart voice alerts even tell you what is occurring and how you should proceed.


In our analysis of 68 expert reviews, the Nest Nest Protect Smoke & Carbon Monoxide Alarm, 3-Pack placed 1st when we looked at the top 12 products in the category. For the full ranking, see below.

From The Manufacturer

It’s time to expect more from your smoke alarm. Nest Protect has been redesigned from the inside out. It has a Split-Spectrum Sensor, tests itself automatically and lasts up to a decade. It’s also the first home alarm you can hush from your phone without any extra hardware required. And it tells you what’s wrong and can even alert your phone. Nest products are made to work together. And they can even work with lights, locks and other products in your home. The Nest Protect can alert the Nest Thermostat when it detects carbon monoxide and the Thermostat can turn off the furnace to try and reduce the leak while you get to safety. Nest is focused on making simple, human, delightful things. That’s how we’re creating the thoughtful home: A home that takes care of the people inside it and the world around it.

Expert Reviews

Expert Summarized Score

9.4
9 expert reviews

User Summarized Score

9.3
8,611 user reviews

What experts liked

Like other Nest products, this combination smoke/CO2 detector is "smart" and compatible with numerous devices.
- BestReviews
The second-generation Nest Protect smoke and carbon monoxide alarm is the best smart smoke alarm for everyone because it’s the easiest to install and use, and it reliably and calmly alerts you to potential danger whether you're home or away using a combination of voice, siren, and smartphone alerts.
- New York Times Wirecutter
November 15, 2018 | Full review
The Nest Protect uses a split-spectrum sensor that Nest says is good at detecting both slow-smouldering fires as well as fast-burning ones.
- Tom's Guide
November 20, 2018 | Full review
Self-checks, Pathlight to help you find your way around and Works with Nest rules just add to the smart simplicity of this device.
- Trusted Reviews
December 12, 2018 | Full review
Nest Protect is also compatible with IFTTT, meaning you can do other clever things with it too.
- Pocket-lint
November 21, 2018 | Full review
Nest Protect goes a step further by adding voice alerts that calmly tell you what kind of danger is present, where it is and how to proceed.
- Top Ten Reviews
June 15, 2018 | Full review
The Nest Protect Smoke & Carbon Monoxide Alarm is another solid smart detector with ample functionality.
- Reviewed
December 12, 2018 | Full review
I particularly liked the Pathlight feature; when you walk under the Protect when the lights are out the light ring glows with a soft white light to guide your way.
- PC Magazine
January 17, 2014 | Full review
With a slimmer profile, a new in-app "silence" button that allows you to turn off smoke and CO alarms remotely (the original Nest Protect doesn't currently support this feature) and integration with the Nest Learning Thermostat , Nest Cam and IFTTT, this $99/£89 detector is the best connected one we've seen yet.
- CNET
July 27, 2015 | Full review

What experts didn't like

Requires some tech knowledge to set up and use.
- BestReviews
These alarms are expensive compared with a standard smoke and CO alarm.
- New York Times Wirecutter
November 15, 2018 | Full review
At $100, the Nest Protect is one of the most expensive, but also one of the most comprehensive, of the smart smoke detectors we've tested.
- Tom's Guide
November 20, 2018 | Full review
There’s no getting away from the fact that it’s expensive, however.
- Trusted Reviews
December 12, 2018 | Full review
It's an expensive bit of kit though – so you're probably wondering if it's worth the outlay and if all the bells and whistles are worthwhile.
- Pocket-lint
November 21, 2018 | Full review
Unfortunately, the device warranty is only two years, unlike the 10-year warranties of the First Alert Onelink and Kidde KN-COSM-B-RF.
- Top Ten Reviews
June 15, 2018 | Full review
The Nest Protect didn’t perform as well as some of its competitors in terms of responsiveness, taking 30 seconds or more after the alarm sounded to send notifications.
- Reviewed
December 12, 2018 | Full review
It has one other thing in common with the Learning Thermostat in that it carries a hefty price tag; at $129 (direct) it's significantly more expensive than what you'll pay for a typical smoke/CO alarm.
- PC Magazine
January 17, 2014 | Full review
The light bulb integrations weren't responsive enough for short smoke events, typically flashing several minutes after our test smoke dissipated.
- CNET
July 27, 2015 | Full review

An Overview On Smoke Detectors

A properly installed, well-maintained and good quality smoke detector can literally save your life and the lives of those you love the most. Deciding the best brand and size for your home can be difficult since so much is riding on the little, plastic devices working as they should.

Battery-operated smoke detectors run solely on batteries, which are easy and affordable to install and replace. You can use a battery-operated detector in virtually any location. Provided the batteries are changed as needed, they will work during power outages as well.

Hardwired smoke detectors are connected directly into your home’s wiring. While they must be professionally installed, many have backup batteries that will last the lifetime of the alarm. So you can feel safe and not worry about remembering to change the batteries.

Many smoke detectors produce a loud, beeping or bleating alarm sound when triggered. This could certainly be ideal to alert you to fire or smoke danger. However, if you have heavy sleepers or young children in your home, they could be confused by or even sleep through the noisy alarm. Devices such as the Nest Protect Smoke and Carbon Monoxide Alarm use voice alerts to explain what is happening. They can awaken you or notify you with spoken, easy to understand warnings.

According to the CDC, at least 430 people die from accidental carbon monoxide poisoning each year in the United States. Considering a combination of smoke and carbon monoxide detector could result in double protection for your home and family. Carbon monoxide can come from leaky furnaces, poorly ventilated wood-burning stoves and many other sources commonly found in homes.

If you have a home security system, you might wish to consider purchasing a smoke detector that will integrate with your current configuration. This could give you increased protection, as many security providers monitor alarms like smoke detectors and can send emergency assistance even if you are away from home or unable to call for help.

Some smoke detectors are compatible with other smart home devices. For instance, devices such as the Nest Protect Smoke and Carbon Monoxide Alarm can be integrated with smart hubs, mobile apps and virtual assistants, like Google Home and Amazon Alexa-enabled devices.

Of course, when shopping for new smoke detectors for your home, office or other location, you must consider how much you want to spend. Fortunately, there are devices that will fit any budget, depending on features, projected lifespan and other attributes.

The Smoke Detector Buying Guide

  • Ionization smoke detectors are ideal for detecting small particles associated with quick-burning flames. However, things like steam or burnt food can cause them to go off, so you might not want to use these in or near your bathroom or your kitchen.
  • Photoelectric smoke detectors are highly rated for early detection of smoldering fires that emit lots of smoke and large particles. While they have fewer false alarms, making them a good choice for kitchens and steamy areas, they might not detect fast-burning flames as quickly.
  • Dual-sensor smoke detectors provide the benefits of ionization and photoelectric smoke detectors. Alternatively, you could install different types of devices in different areas of your home.
  • Look for a UL stamp on a smoke detector before you buy it. Underwriters Laboratories (UL LLC) is a global safety company that certifies, validates, tests, verifies, inspects and audits a wide range of products including smoke detectors. The UL certification mark is the single most accepted one in the United States.
  • Be sure to check the date on a smoke detector as well. Although recommendations can vary between makes and models, Consumer Reports recommends replacing smoke detectors every 10 years. Note that this should be 10 years after the date the device was manufactured, not the date it was installed. Fortunately, the manufacture date is printed on the underside of smoke detectors.
  • The National Fire Protection Association recommends installing smoke alarms inside every bedroom as well as outside each sleeping area. On floors without bedrooms, smoke detectors should be installed in living areas, such as the living room or den, and near stairways to upper levels as well.
  • While homes built to earlier standards might be exempt, every state has regulations and standards regarding where and how smoke detectors are installed in residential buildings. Check the regulations or recommendations for your state, as some states require that you make necessary upgrades before renting or selling your home.
  • The U. S. Fire Administration recommends testing your smoke detectors monthly. Put a monthly reminder on your phone or calendar to push the button on every detector in your home to make sure the alarm works properly.
  • USFA also recommends changing the batteries in battery-operated smoke detectors one to two times per year. An effective way to remember this is to replace them every time you change your clocks for Daylight Savings.