10 Best Carbon Monoxide Detector 2026 in the United States
#1
Winner
Kidde Carbon Monoxide Detector, Propane, Natural, Methane, & Explosive Gas Alarm, Plug-in Wall with 9-Volt Battery Backup, Digital LED Display
The Kidde Carbon Monoxide Detector is designed to detect carbon monoxide as well as propane, natural gas, methane, and other explosive gases, making it a versatile safety device for homes with multiple fuel sources. It plugs into a standard 120V outlet and includes a 9-volt battery backup, allowing it to continue operating during power outages for uninterrupted protection. The digital LED display provides current CO levels and alerts for explosive gases, offering clear, real-time information beyond a simple alarm sound.
Rating
10.0
Chosen by1,314
Sensor Type
Power Source
Display and Alerts
Most important from
243 reviews
#2
First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pack
The First Alert Combination Smoke & Carbon Monoxide Alarm (SMICO100) offers a practical 2-in-1 safety solution, combining smoke and carbon monoxide detection in one battery-powered device. It uses ionization sensor technology, which is responsive especially to fast-flaming fires, and includes First Alert’s Precision Detection to help reduce false alarms often caused by cooking. Being battery-operated with included alkaline AA batteries makes installation straightforward, without the need for wiring.
Rating
9.1
Sensor Type
Power Source
Test and Silence Features
Most important from
683 reviews
#3
Kidde Smart Smoke and Carbon Monoxide Detector, Ring App Enabled for Real-Time Notifications, Hardwired Alarm, AA Backup Battery
The Kidde Smart Smoke and Carbon Monoxide Detector offers dual sensing technology with photoelectric and electrochemical sensors, making it effective in detecting both smoke and carbon monoxide. It is hardwired for power but includes AA batteries as a backup, ensuring continuous operation even during outages. The detector provides real-time alerts through the Ring app, which is useful whether you are home or away, and these notifications don’t require a subscription—though one is available for added 24/7 monitoring. Its smart connectivity allows you to link multiple alarms throughout your home, sending mobile alerts from any hardwired device, which is a big plus for comprehensive safety coverage. The device also integrates with Alexa, allowing voice notifications for convenience.
Rating
9.1
Sensor Type
Interconnectivity
Most important from
221 reviews
Top 10 Best Carbon Monoxide Detector 2026 in the United States
#1
Winner
Kidde Carbon Monoxide Detector, Propane, Natural, Methane, & Explosive Gas Alarm, Plug-in Wall with 9-Volt Battery Backup, Digital LED Display
Kidde Carbon Monoxide Detector, Propane, Natural, Methane, & Explosive Gas Alarm, Plug-in Wall with 9-Volt Battery Backup, Digital LED Display
Power Source: Plug In, 9V battery backup
Display and Alerts: Digital LED, 85-decibel alert
Test and Silence Features: Peak Level Memory function
Interconnectivity: None
Chosen by 1314 this week
First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pack
First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pack
Sensor Type: Ionization
Power Source: Battery Powered
Display and Alerts: Test, silence button; end-of-life warning
Test and Silence Features: Test and silence button
Interconnectivity: No interconnectivity support
Lifespan and Warranty: Replace every 7-10 years
Kidde Smart Smoke and Carbon Monoxide Detector, Ring App Enabled for Real-Time Notifications, Hardwired Alarm, AA Backup Battery
Kidde Smart Smoke and Carbon Monoxide Detector, Ring App Enabled for Real-Time Notifications, Hardwired Alarm, AA Backup Battery
Sensor Type: Photoelectric, Electrochemical
Power Source: Hardwired
Display and Alerts: Audible, Real-time Ring app alerts
Test and Silence Features: Basic test and silence
Interconnectivity: Link alarms, mobile alerts, Alexa
First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack
First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack
Sensor Type: Ionization
Power Source: Corded Electric with battery
Test and Silence Features: Test/silence button
Interconnectivity: Yes
FIRST ALERT Plug-In Carbon Monoxide Detector, 3 Count (Pack of 1), CO600 , White, 6.75 x 6.9 x 9 inches
FIRST ALERT Plug-In Carbon Monoxide Detector, 3 Count (Pack of 1), CO600 , White, 6.75 x 6.9 x 9 inches
Sensor Type: Electrochemical
Power Source: Plug-in
Display and Alerts: No display, Audible alarm
Interconnectivity: None
Lifespan and Warranty: 7 Year Limited
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SITERWELL Plug in Carbon Monoxide Detector 10 Year Battery, CO Alarm Detector with Electrochemical Sensor and Sound Warning, AC Powered Portable Carbon Monoxide Detector for Home Office Travel,4-Pack
SITERWELL Plug in Carbon Monoxide Detector 10 Year Battery, CO Alarm Detector with Electrochemical Sensor and Sound Warning, AC Powered Portable Carbon Monoxide Detector for Home Office Travel,4-Pack
Sensor Type: Electrochemical
Power Source: Battery Powered
Display and Alerts: Audible alerts 85+ dB, breathing light
Test and Silence Features: One-touch silence button
Interconnectivity: None
Lifespan and Warranty: Built-in 10-year battery
FIRST ALERT Carbon Monoxide Detector, No Outlet Required, Battery Operated, CO400, White, 2 Count (Pack of 1)
FIRST ALERT Carbon Monoxide Detector, No Outlet Required, Battery Operated, CO400, White, 2 Count (Pack of 1)
Sensor Type: Electrochemical
Power Source: Battery Powered
Display and Alerts: Audible and Visual
Interconnectivity: No
Lifespan and Warranty: 5-Year
Siterwell Travel Carbon Monoxide Detector, 10 Year Product Life Carbon Monoxide Detectors with LCD Digital Display and Sound Warning, ETL Listed, Portable Carbon Monoxide Detector for Home, 4-Pack
Siterwell Travel Carbon Monoxide Detector, 10 Year Product Life Carbon Monoxide Detectors with LCD Digital Display and Sound Warning, ETL Listed, Portable Carbon Monoxide Detector for Home, 4-Pack
Sensor Type: Electrochemical
Power Source: Two AA alkaline batteries included
Display and Alerts: LCD, colored LEDs, audible alarm
Test and Silence Features: Basic test and silence functions
Lifespan and Warranty: 10-year lifespan, 3-year warranty
Kidde Carbon Monoxide Detector, Plug in Wall with AA Battery Backup, Test-Hush Button
Kidde Carbon Monoxide Detector, Plug in Wall with AA Battery Backup, Test-Hush Button
Power Source: Plug In with AA backup
Display and Alerts: No display; 85dB audible alarm
Test and Silence Features: Test-Hush button
Interconnectivity: None
#10
First Alert SMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack
First Alert SMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack
Sensor Type: Photoelectric
Power Source: Battery Powered
Interconnectivity: No
Lifespan and Warranty: 10-year battery, Warranty
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Buying Guide for the Best Carbon Monoxide Detector
Choosing the right carbon monoxide detector is crucial for ensuring the safety of your home and loved ones. Carbon monoxide (CO) is a colorless, odorless gas that can be deadly if not detected early. A good CO detector will alert you to the presence of this dangerous gas, giving you time to take action. When selecting a carbon monoxide detector, consider the following key specifications to ensure you get the best fit for your needs.Sensor TypeThe sensor type in a carbon monoxide detector determines how it detects CO gas. There are three main types: electrochemical, metal oxide semiconductor, and biomimetic. Electrochemical sensors are the most common and reliable, providing accurate readings and a longer lifespan. Metal oxide semiconductor sensors are less expensive but may not be as accurate. Biomimetic sensors use a gel that changes color when exposed to CO, which can be less precise. For most users, an electrochemical sensor is the best choice due to its reliability and accuracy.
Power SourceCarbon monoxide detectors can be powered by batteries, hardwired into your home's electrical system, or plugged into an outlet. Battery-powered detectors are easy to install and can be placed anywhere, but you need to remember to replace the batteries regularly. Hardwired detectors are more permanent and often come with a battery backup in case of power outages. Plug-in detectors are convenient but need to be placed near an outlet. Choose a power source that fits your home's setup and your preference for maintenance.
Display and AlertsA good carbon monoxide detector should have a clear display and loud alerts. The display can show CO levels in parts per million (ppm), which helps you understand the severity of the situation. Some detectors also have digital displays that show the peak level of CO detected. Alerts should be loud enough to wake you up if CO levels rise while you are sleeping. Look for detectors with both visual and audible alarms to ensure you are alerted in any situation.
Test and Silence FeaturesTest and silence features are important for maintaining your carbon monoxide detector. The test button allows you to check if the detector is working properly, while the silence button lets you temporarily mute the alarm if it goes off accidentally. Regularly testing your detector ensures it is functioning correctly, and the silence feature can prevent unnecessary noise while you address the cause of the alarm. Make sure the detector you choose has easy-to-use test and silence buttons.
InterconnectivityInterconnectivity allows multiple carbon monoxide detectors to communicate with each other. If one detector senses CO, all interconnected detectors will sound the alarm, providing a more comprehensive warning system. This feature is especially useful in larger homes or multi-story buildings. If you have a larger home or want to ensure maximum safety, look for detectors that can be interconnected either wirelessly or through hardwiring.
Lifespan and WarrantyThe lifespan of a carbon monoxide detector is the period during which it can reliably detect CO. Most detectors have a lifespan of 5 to 10 years. After this period, the sensors may become less accurate, and the detector should be replaced. Check the manufacturer's recommendations for the lifespan and look for detectors with a warranty that covers at least the expected lifespan. This ensures you are protected against defects and can rely on the detector for the specified period.