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10 Best Carbon Monoxide Detector 2026 in the United States
#1
Winner
NICGOL 4 in 1 Upgraded Natural Gas Leak Detector and Carbon Monoxide Detectors, Dual Sensor Gas Leak Detector & Carbon Monoxide Detectors Plug in (Temperature & Humidity) for Home, RV (Black)
This NICGOL 4-in-1 carbon monoxide and natural gas detector stands out with its combined ability to monitor CO, natural gas leaks, temperature, and humidity, using catalytic sensors. It plugs into a standard AC outlet, avoiding the need for batteries, which makes it convenient for continuous use in homes, RVs, or similar spaces. The detector features both loud (≥85 dB) sound alarms and flashing red lights to quickly notify you of dangerous gas levels, which is especially useful in noisy environments or for those with hearing difficulties.
Rating
10.0
Chosen by1,458
Power Source
Display and Alerts
Test and Silence Features
Most important from
1892 reviews
#2
Kidde Carbon Monoxide Detector, Plug In Wall with 9-Volt Battery Backup, Digital LED Display - 2 Pack
The Kidde Carbon Monoxide Detector offers a reliable solution for home safety with its ionization sensor, which effectively detects carbon monoxide levels. It’s designed to plug directly into a standard 120V outlet, making installation quick and simple, and it includes a 9-volt battery backup so it continues working during power outages. The digital LED display is a helpful feature that shows the current carbon monoxide levels, giving you clear, real-time information.
Rating
9.1
Power Source
Display and Alerts
Test and Silence Features
Most important from
27616 reviews
#3
Kidde Carbon Monoxide Detector, Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable
The Kidde Carbon Monoxide Detector is a solid choice for anyone in need of a reliable and portable CO alarm. Its electrochemical sensor technology effectively detects carbon monoxide, ensuring safety during power failures since it operates on two included AA batteries. This makes it easy to install without any complicated wiring, allowing you to place it on a wall or a tabletop, which enhances its versatility. The product includes useful features like a green LED that confirms it's powered on, an 85-decibel alarm with a red LED for alerts, and an event memory that records the last detection, adding to its functionality.
Rating
8.5
Power Source
Display and Alerts
Test and Silence Features
Most important from
36287 reviews
Top 10 Best Carbon Monoxide Detector 2026 in the United States
#1
Winner
NICGOL 4 in 1 Upgraded Natural Gas Leak Detector and Carbon Monoxide Detectors, Dual Sensor Gas Leak Detector & Carbon Monoxide Detectors Plug in (Temperature & Humidity) for Home, RV (Black)
NICGOL 4 in 1 Upgraded Natural Gas Leak Detector and Carbon Monoxide Detectors, Dual Sensor Gas Leak Detector & Carbon Monoxide Detectors Plug in (Temperature & Humidity) for Home, RV (Black)
Sensor Type: Catalytic
Power Source: AC
Display and Alerts: Colorful LCD, Audible and Visual alarms
Test and Silence Features: Test button
Chosen by 1458 this week
Kidde Carbon Monoxide Detector, Plug In Wall with 9-Volt Battery Backup, Digital LED Display - 2 Pack
Kidde Carbon Monoxide Detector, Plug In Wall with 9-Volt Battery Backup, Digital LED Display - 2 Pack
Sensor Type: Ionization
Power Source: Plug In, 9V battery backup
Display and Alerts: Digital LED, 85dB alarm
Test and Silence Features: Peak memory, last test info
Interconnectivity: None
Lifespan and Warranty: 10 year limited warranty
Kidde Carbon Monoxide Detector, Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable
Kidde Carbon Monoxide Detector, Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable
Sensor Type: Electrochemical
Power Source: Battery Powered
Display and Alerts: Green LED, 85-decibel alarm, red LED
Test and Silence Features: Test-hush button
Lifespan and Warranty: 10-year limited warranty
Kidde Smoke & Carbon Monoxide Detector, 10-Year Battery Powered, LED Warning Light Indicators, 30CUD10
Kidde Smoke & Carbon Monoxide Detector, 10-Year Battery Powered, LED Warning Light Indicators, 30CUD10
Sensor Type: Photoelectric, Electrochemical
Power Source: Battery Powered
Display and Alerts: LED indicators, 85-decibel alarm
Test and Silence Features: Manual test button, self-tests
Interconnectivity: No
Lifespan and Warranty: 10 years
First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMCO100, 1-Pack,White
First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMCO100, 1-Pack,White
Sensor Type: Photoelectric
Power Source: Battery Powered
Display and Alerts: Test/silence button, end-of-life warning
Test and Silence Features: Test and silence button
Interconnectivity: None
Lifespan and Warranty: 10 Years Limited warranty
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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
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 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
#10
Vilfet 5-in-1 Carbon Monoxide Detectors, Natural Gas Leak Detector, Plug-in & Battery Backup Portable Co Detector, Co Gas Temp Humidity Sensor, HD Display Screen Vilfet, 1-Pcs, Black
Vilfet 5-in-1 Carbon Monoxide Detectors, Natural Gas Leak Detector, Plug-in & Battery Backup Portable Co Detector, Co Gas Temp Humidity Sensor, HD Display Screen Vilfet, 1-Pcs, Black
Sensor Type: carbon monoxide, gas, temp, humidity
Power Source: plug-in with 9V battery backup
Display and Alerts: clear HD display, 85dB adjustable alarm
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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.