Nest Protect marries safety features like smoke, fire, and carbon monoxide detection with intuitive smart features. It's also a companion to your home security system and even a nightlight.
It comes with an option for voice alerts to minimize panic. And it connects to the Nest app, so you'll get alerts from anywhere.
Learn more in our full review of Nest Protect, or read on to compare this top carbon monoxide detector to our other favorites.
Top 5 carbon monoxide detectors
- : Best overall
- : Best voice control
- : Budget pick
- : Easy installation
- : Best value
Compare CO detectors and alarms
After hours of research and testing, we’ve found the best carbon monoxide detectors and smoke detector combos available. From basic battery operated to smart carbon monoxide alarm devices, you can find the top options here.
|
Product
|
List price
|
Smart features
|
Digital display
|
Smoke sensor
|
Learn more
|
||
|---|---|---|---|---|---|---|---|
| Best overall |
 Nest Protect |
Yes |
Yes |
Yes |
View on Amazon | Read review | |
| Best voice control |
 First Alert OneLink |
Yes |
No |
Yes |
View on Amazon | Read review | |
| Budget pick |
 Alert Plus Carbon Monoxide Detector |
No |
No |
No |
View on Amazon | Read review | |
| Easy installation |
 Kidde Nighthawk Plug in |
No |
Yes |
No |
View on Amazon | Read review | |
| Best value |
 Kidde Battery-Operated |
No |
No |
No |
View on Amazon | Read review |
*Amazon.com prices as of 08/18/21 2:18 pm MST. See full disclaimer.
CO detector and alarm reviews
1. Google Nest Protect: Best carbon monoxide detector
Nest Protect combines smoke and carbon monoxide detection and works with an app. When you download it, you can get alerts to your phone and even silence alarms if necessary. With state-of-the-art sensors for both fire and carbon monoxide, this alarm is one of the best for homeowners or renters.
Works with other smart home devices Doubles as smoke detector Comes with battery or hardwire capabilities Features voice notifications
When the battery dies, you'll need a new alarmYou can't change the batteries in this carbon monoxide alarm, so you'll need to replace the whole thing once it expires. Even at $120, Nest Protect is still a good value if it lasts for its full life expectancy of 10 years.
Learn more about the Nest Protect in our full product review.
2. First Alert Onelink: Best voice control
The Onelink smart smoke and carbon monoxide detector can do a lot. Using your home’s Wi-Fi, the carbon monoxide alarms can talk to one another and synchronize to alert you if there is a gas leak or fire. You can also control it from your Apple device through an app, so you can silence the alarm or get notifications on your phone.
10-year battery Mobile app Voice alarm Syncing system Built-in smoke alarm
Big price tag When the battery dies, you'll need a new alarmOnelink doesn't have a battery compartment that you can access, so when it dies you'll need to get a new CO detector. With a price tag over $200, that steep replacement cost might be more than some want to pay.
3. Alert Plus Carbon Monoxide Detector: Budget pick
The Alert Plus Carbon Monoxide and Smoke Detector is a simple device with one job—to keep you and your family safe from CO poisoning. And while it doesn’t have any smart features, it does have a powerful 85 dB siren to warn everyone in your home.
Affordable Batteries included
No smart featuresIt’s also one of the easiest devices to install. Just mount the backplate to the wall, add the batteries (included with the unit), and click the monitor into place.
And for under $20, you can afford to add more than one to your home. Place your Alert Plus CO detector in the basement, kitchen, garage, or anywhere you burn fossil fuels. We even saw reviews from users who kept it in their vehicle.
4. Kidde Nighthawk Plug-in: Easy installation
When we say installing the Kidde Nighthawk carbon monoxide detector is easy, we mean it. You won't need drills, screws, or even batteries. Just plug it in, and it’s all set. It also comes with a 9-volt backup battery in case of a power outage.
Affordable price Digital display Positive customer reviews Backup battery
Not compatible with home automation Hardwired onlyPlug-in options like this CO detector keep renters and landlords happy. No need to drill holes in the wall.
Like other carbon monoxide detectors, it comes with a test button and LED screen to show the CO levels in your home. When the Nighthawk detects dangerous levels in your home, it will emit a signature beeping pattern so you won’t confuse it with any other alarms in your home.
Loud sirens are the standard for carbon monoxide detectors, but what if someone in your family has hearing loss? We found wire-in units that connect to smoke and carbon monoxide detectors that trigger a strobe light when there's an emergency.
5. Kidde Battery-Operated: Best value
The Kidde Battery Operated CO detector checks the air every 15 seconds for continuous monitoring with its electrochemical sensor. It doesn’t rely on hardwiring either, so it will continue to work even during a power outage. To top it off, it has a powerful 85 dB siren that sounds when it senses the poisonous gas.
No drilling required Test button Signature beep
No home automation No smoke detection No battery backupWhile it lacks the smart features seen in the Nest and OneLink carbon monoxide detectors, it has all the marks of a reliable device. In addition to its loud siren and consistent monitoring, it has a green and red light to give visual safety cues to people with hearing loss.
If you need multiple CO detectors, this is a good device to start with. It’s affordable, dependable, and easy to install.
Types of carbon monoxide detectors
There are several types of carbon monoxide detectors available for purchase. Some include multiple functions:
- Dual-function: sense different threats like CO, smoke, and fire
- Digital: show you levels of carbon monoxide on a digital screen
- Smart: run diagnostics and sync with home automation apps
- Hardwired: wire into your home’s electrical grid, work unless the power goes out
- Battery-operated: basic sensing and display, need batteries to operate
Our approach
To find the best carbon monoxide detectors, we compared smart features, installation ease, and detection accuracy. We also looked at user reviews to get a better idea of how these devices work first hand. Visit our methodology page to learn more about how we conduct reviews like this one.
Carbon monoxide detectors FAQ
Check out our full frequently asked questions page to learn more about carbon monoxide detectors.
Carbon monoxide poisoning causes flu-like symptoms like dizziness, nausea, vomiting, headaches, confusion, or fainting.
If you're at home, get out of the house and call 911. CO poisoning doesn't always hit suddenly and doesn't leave your system quickly, so it's a good idea to seek medical attention as soon as you can.
Every year, 400 Americans die from accidental carbon monoxide poisoning and 20,000 are admitted to the emergency room.
Everyone is susceptible to carbon monoxide poisoning, but children, older adults, people who are physically ill, and pets are more likely to be affected by CO.
Carbon monoxide detectors work like smoke detectors but detect levels of carbon monoxide instead.
CO detectors usually have one or more of these sensors:
- Biomimetic detectors use color-changing gels that absorb carbon monoxide which triggers the alarm.
- Metal oxide semiconductors have silica chips that detect CO and send electrical signals to trigger an alarm.
- Electrochemical sensors use electrodes in chemical solutions that sense changes in electrical currents when carbon monoxide is present, and they sound the alarm.
Most professionally monitored security systems come with a CO detector. Check out our top security providers to see which home security systems include CO detectors with their monitoring plans.
Put a carbon monoxide detector outside every separate sleeping area in your home, your kitchen, basement, and garage. We recommend finding an area far enough away from the carbon monoxide source but close enough to the areas you and your family normally occupy.
Check out our full guide on where to install your own carbon monoxide detectors.
CO detector maintenance
Most carbon monoxide detectors last an average of five years. Although the product’s lifetime will vary depending on your make and model, you can still get the most out of your detector by wiping it down weekly to keep it clean from dust and debris.
Just like your smoke detectors, it's a good idea to test your CO detector monthly. Start by pressing the “test” button to ensure the siren works. If your detector is older, you can purchase a carbon monoxide meter to find out if your detector is still fully functional. If the carbon monoxide sensor doesn’t go off when you test it, it’s probably time to buy a new one.
Sources of carbon monoxide gas
Image: SafeWise.com
Carbon monoxide (CO) has been called the “silent and invisible killer” because it doesn’t have a smell, color, or taste. It’s one of the most prevalent causes of death due to poisoning in America. Any time you burn something—like gasoline, natural gas, wood, oil, propane, or charcoal—carbon monoxide is released into the air.
In outdoor spaces, this usually isn’t a health hazard because there is enough area for the CO to dissipate, so particles never amount to a toxic level. The danger comes when carbon monoxide is released in a contained area like your home, RV, or garage.
Anything that burns will create carbon monoxide. It’s not just your stove, fireplace, or grill either. Here are some of the things that can create carbon monoxide when turned on:
- Appliances
- Gas grills
- Gas stoves
- Gas or oil-burning furnaces
- Fuel-burning water heaters
- Non-electric space heaters
- Tools
- Snowblowers
- Lawnmowers
- Pressure washers
- Generators
- Non-electric cars, trucks, and boats
- Chain saws
Know what to do and what not to do
Lighting a fire in your fireplace is okay if it’s properly ventilated. However, if you do the following, you could cause dangerous levels of carbon monoxide to build in your home.
Do
- Always vent gas appliances properly
- Get your chimney checked annually to ensure proper ventilation
Don't
- Burn gas grills inside your home
- Use your gas stove/oven for heating
- Leave the car running with the garage door closed
- Patch or seal vent pipes with tape or unapproved products or carbon monoxide could leak into your home
- Burn charcoal inside
- Run a generator in your home or within 20 feet of your home’s doors, windows, and garage
- Turn on your car if the tailpipe is blocked (by snow or anything else)
Related pages
Disclaimer
*Amazon.com list price as of 08/18/21 2:18 pm MST. Product prices and availability are accurate as of this date/time indicated and are subject to change. Any prices and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product. Safewise.com utilizes paid Amazon links.
Certain content that appears on this site comes from Amazon. This content is provided “as is” and is subject to change or removal at any time.
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