Protect your home and family with a carbon monoxide detector

Carbon Monoxide Detector

A carbon monoxide detector is essential for every home as it quickly calls out the odorless, invisible wrath of CO. Some detectors can even tell you where it is. The Google Nest Protect Smoke and Carbon Monoxide Alarm can detect harm in seconds and send alerts right to your phone. Whether you’re in your home, at work, or on vacation, you can rest assure you, your family, and your pets will be safe from CO gases.

Best Overall: Google Nest Protect Smoke and Carbon Monoxide Alarm, S3000BWES

Take the worry out of the unknown with this alarm. With it, you can connect to Wi-Fi and get phone alerts from anywhere. It will speak up and let you know if it detects smoke or carbon monoxide and will tell you where it is. It will even send you heads-up alerts like if the batteries are running low or your toast is burning.

This battery-powered detector has two vital sensors, the split-spectrum sensor, and the 10-year monoxide sensor. The split-spectrum sensor uses two wavelengths of light that look for fast or slow-burning fires. Meanwhile, other one detects the odorless gas and tells you where it is hiding.

When it comes to fires or carbon monoxide gases in your home, every second counts. This fast detecting system, plus the phone alerts and all its other features, is what makes thist the best overall option for protecting your home, family, and pets.


  • Wi-Fi phone alerts
  • Dual sensor
  • Smoke/CO detection and location
  • Low-battery warning


  • May need battery replacement after a few months

Best Overall

Google Nest Protect Smoke and Carbon Monoxide Alarm

CO detection with phone alerts

Worry-free protection that sends and locates harmful CO levels right to your phone.

Best Runner Up: First Alert Smoke Detector and Carbon Monoxide Alarm, SCO5CN

This battery-operated detector will keep your family safe with its continuous monitoring of smoke and CO levels, even in the event of a power outage. It has dual sensors, a photoelectric sensor, and an electrochemical CO sensor. The photoelectric sensor detects smoke from fires while the electrochemical CO sensor picks up on leaks from fuel-burning appliances. Both of these sensors help to minimize false alarms.

In the event of a smoke or CO detection, this unit has multiple different alarms and indicator lights to help you determine the issue quickly and call 911. This simple to install and use unit can be just the device that saves your life!


  • Battery-operated
  • Dual sensors
  • Easy to install
  • Alarms and indicator lights


  • No indicator light to show it’s on

Best Runner Up

First Alert Smoke Detector and Carbon Monoxide Alarm

Dual sensor detector with alarms and lights

Easy to install designs for fast and accurate detection.

Best Plug-in: Kidde Nighthawk Carbon Monoxide Detector Alarm, 900-0076 KN-COPP-3

Exposure to carbon monoxide is the leading cause of accidental poisoning deaths in North America. With this detector, you and your family will not be part of that statistic! This easy, plug-in design is complete with a backup 9-volt battery and has a digital display that shows you the levels of carbon monoxide the unit has detected and stored. It updates every 15 seconds and has a blinking light display that lets you know its working and operating normally.

This easy-to-read and use unit will leave you feeling worry-free as it is trusted to alert you if CO levels reach an unhealthy point. You will be alerted with an 85-decibel alarm that will beat every five seconds until the levels decrease. Get the protection you need on every floor of your home.


  • Backup 9-volt battery
  • Digital display
  • Updates every 15 seconds


  • Older manufacturer dates don’t operate as well

Best Plug-in

Kidde Nighthawk Carbon Monoxide Detector Alarm

Plug-in detector with digital display

CO monitor that detects and stores levels every 15 seconds.

Best Battery-Operated: Kidde Combination Smoke/Carbon Monoxide Alarm, 210026043 KN-COSM-BA

This battery-powered unit will literally speak to you to help keep you and your family safe. Featuring a voice alarm and voice announcements, this detector will say “Fire!” when it detects smoke or fire. Plus, it will say “warning carbon monoxide” when it detects a hazardous level of CO gas. The announcements will let you know when “hush mode” is activated or canceled and will let you know if carbon monoxide was previously detected.

The alarm has an easy to install design and can be placed in any room in your home. Since it is battery-operated, you will never have to worry that it is not working, even during power outages. When the battery is running low, it will announce “Low Battery” as well as initiating a chirping alarm and blinking red light. This detector will surely eliminate confusion and clearly warn you of potential harm.


  • Battery-powered
  • Voice alerts and announcements
  • Low battery warning


  • May be a bit sensitive

Best Battery-Operated

Kidde Combination Smoke/Carbon Monoxide Alarm

Voice alert smoke and CO alarm

A battery-operated unit that eliminates confusion with voice alerts.

Best Budget-Friendly: First Alert Carbon Monoxide Detector, CO400

This detector is simple, accurate, and perfect for those on a budget. Place this unit anywhere in your home. It’s battery-operated and comes with an optional wall mount. It offers continuous monitoring of CO levels and will alert you with an 85-decibel alarm if levels become dangerous.

This detector features an advanced electrochemical CO sensor. It is the most accurate detection technology and works no matter where in your home the unit is located. Sleep soundly and live your days worry-free with this alarm. The invisible, poisonous gas can no longer hide in your home!


  • Battery-operated
  • Optional wall mount
  • Electrochemical CO sensor


  • Battery door is hard to open

Best Budget-Friendly

First Alert Carbon Monoxide Detector

Simple carbon monoxide detector with alarm

Battery-operated detector with an electrochemical CO sensor.

Bottom line

Carbon monoxide gases can be released from different fuel-burning appliances such as a furnace, dryer vent, or a chimney. The scariest part of it all is that it is odorless, tasteless, and extremely poisonous. Luckily there are now a variety of carbon monoxide detectors to help you catch it early so you can protect your home, family, and pets.

We recommend the Google Nest Protect Smoke and Carbon Monoxide Alarm to eliminate worry with fast, accurate notifications. One of the best things is that this unit can even help you determine the location of the CO or smoke. Every second matters when it comes to harmful smoke or gases, so each unique feature is one step closer to safety.

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