Best Nest Co2 In April 2025

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Check out our product review of the Best Nest Co2. We tried 10 models and can tell you the absolute best varieties.

To help you in your search, we have completed this list of the Best Nest Co2.

Top Rated Best Nest Co2 Of 2025

Rank	Product Name	Score
1	Kidde Carbon Monoxide Detector Alarm |Battery Operated | Model # KN-COB-LP2 9CO5-LP2 Buy Now	9.7 Buy Now
2	Ring Smoke/CO Listener Buy Now	9.5 Buy Now
3	Kidde Nighthawk Plug-In AC/DC Carbon Monoxide Alarm Detector with Digital Display KN-COPP-3 Buy Now	9.1 Buy Now
4	Kidde 21026043 Battery-Operated(Not Hardwired) Combination Smoke/Carbon Monoxide Alarm with Voice Warning KN-COSM-BA Buy Now	8.8 Buy Now
5	Nest Protect - Smoke sensor - 802.11b/g/n, Bluetooth 4.0 - battery powered Buy Now	8.6 Buy Now
6	Kidde AC Plug-in Carbon Monoxide and Explosive Gas Detector Alarm | Nighthawk Sensor Buy Now	8.3 Buy Now
7	First Alert Dual-Power Carbon Monoxide Detector Alarm | Plug-In with Battery Backup Buy Now	8.1 Buy Now
8	Kidde Three Story Fire Escape Ladder with Anti-Slip Rungs | 25 Feet | Buy Now	7.8 Buy Now
9	Kidde Smoke and Carbon Monoxide Detector Alarm with Voice Warning | Hardwired w/10 Buy Now	7.5 Buy Now
10	First Alert BRK SC9120B Hardwired Smoke Detector and Carbon Monoxide (CO) Detector Buy Now	7.2 Buy Now

1. Kidde Carbon Monoxide Detector Alarm |Battery Operated | Model # KN-COB-LP2 9CO5-LP2

• Loud 85 decibel alarm
• Low battery hush
• 2 aa battery backup
• Low battery signal
• Event memory

2. Ring Smoke/CO Listener

• Ring alarm smoke and co listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
• This device does not detect fire, smoke or carbon monoxide and is intended to work with ul listed smoke and co detectors that are 10 years old or less.
• Easy setup in minuteswithout tools or professional installation. requires ring alarm security system (sold separately).
• Battery life 3 years max. batteries are replaceable.
• Manage ring alarm smoke and co listener and other ring products with the ring app.
• Optional 24/7 professional monitoring is just $10/month. no contracts or cancellation fees.

3. Kidde Nighthawk Plug-In AC/DC Carbon Monoxide Alarm Detector with Digital Display KN-COPP-3

• Peak level button displays the peak co level recorded by the alarm since it was last reset or unplugged
• Led operation blinking dot in lower right corner of display denotes normal operation
• Power source: 120vac. temperature range-40f (4.4c) to 100f (37.8c). humidity range-5%-95% relative humidity (rh)
• Ten years after the initial power up, this alarm will beep two times every 30 seconds to indicate that it is time to replace the alarm.
• Note: this co alarm is not battery operated. however, these alarms are equipped with 9 volt battery backup the 9 volt battery is to supply short term back-up during a power outage.
• Test button functions tests the unit for proper operation and resets the carbon monoxide alarm

4. Kidde 21026043 Battery-Operated(Not Hardwired) Combination Smoke/Carbon Monoxide Alarm with Voice

• Combined carbon monoxide and smoke alarm a single unit can be installed where previously, two were needed. reduces installation time and helps to keep home dcor attractive.
• Battery - provides protection even during power outages when many fire and carbon monoxide incidents occur. the unit warns of a low battery condition by announcing low battery and by initiating an alarm chirp and activating a flashing red led. the battery door will not close unless the batteries are properly installed. note : the date printed on the item is manufact...
• Audio alarm: 85 db at 10 feet. test/reset button and leds tests alarm circuitry and triggers the voice announcement. flashing green for normal operation and flashing red for alarm condition. humidity range: 10 percent to 95 percent relative humidity non-condensing
• Voice announcements - hush feature temporarily silences nuisance alarms with hush mode activated and hush mode cancelled voice announcement. if the alarm had detected a co level of 100ppm or higher, the unit will announce carbon monoxide previously detected to warn of the co incident, when the test/ reset button is pressed.temperature range:40f (4.4c) to 100f ...
• Voice alarm announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. alarm announces fire! when a smoke or fire hazard is detected and announces warning carbon monoxide when a co hazard is detected

5. Nest Protect - Smoke sensor - 802.11b/g/n, Bluetooth 4.0 - battery powered

• A light in the dark: usually nest protect has its light turned off, but when you walk underneath it, pathlight can light your way.
• Smoke and co locator: nest protect speaks up if theres smoke or co and tells you where it is, so you know what to do.
• Heads-up. get a friendly voice alert so you can handle burning toast before it becomes a burning toaster.
• Phone alerts: nest protect sends you a message when theres a problem or the batteries run low.
• App silence. nest protect is the first alarm you can hush from your phone. simply walk to the nest protect that noticed the problem and open the nest app.
• Know from anywhere. connect nest protect to wi-fi and it will send an alert to your phone if the alarm goes off or the batteries run low.

6. Kidde AC Plug-in Carbon Monoxide and Explosive Gas Detector Alarm | Nighthawk Sensor

• Protects you and your family from two deadly threats: carbon monoxide and explosive gas.
• Sounder alarm the kn-coeg-3 offers a loud 85-decibel pulsing alarm that will sound to alert you to a potential problem.
• Digital display and peak level button displays the peak co level recorded by the alarm since it was last reset
• Kiddes carbon monoxide alarms meet the requirements of underwriters laboratories (ul), an independent facility that tests products for compliance with widely-accepted safety standards
• Peak level memory - recalls the highest co concentration detected
• Two alarms in one detects carbon monoxide and explosive gas

7. First Alert Dual-Power Carbon Monoxide Detector Alarm | Plug-In with Battery Backup

• Keep your family safe with this digital display, plug in carbon monoxide alarm, it works with any standard outlet and also has a battery backup for continuous monitoring of carbon monoxide levels, even if there's a power failure
• A loud 85 decibel alarm sounds when carbon monoxide levels reach dangerous levels
• Features an advanced electrochemical carbon monoxide sensor, peak level feature displays the highest concentration of carbon monoxide measured
• To ensure complete protection make sure to place one on each level of your home and in each bedroom
• All first alert co alarms are rigorously tested to meet ul standards
• 7 year limited warranty, equipped with end of life signal chirp, so you know when its time to replace the unit for safety

8. Kidde Three Story Fire Escape Ladder with Anti-Slip Rungs | 25 Feet |

• No assembly or tools are required, 5-year
• Easy to use. attaches quickly to most common windows
• Flame resistant, durable and sturdy ladder
• Strong and durable ladder tested to 1, 000 pounds
• Tangle free design fast and easy to deploy with anti-slip rungs

9. Kidde Smoke and Carbon Monoxide Detector Alarm with Voice Warning | Hardwired w/10

• Compatible with kidde, firex, code one and sentinel products
• Ionization sensing technology - ideal for detecting fast flaming and other types of fires. temperature range : 40 degree f (4.4 degree c) to 100 degree f (37.8 degree c)
• Voice warning system - verbally announces fire! or warning! carbon monoxide to help distinguish between threats. audio alarm: 85 db at 10 feet
• Provides protection from two hazards - fire and co in one unit with 10-year sealed lithium battery backup.
• Hush feature - temporarily silences nuisance alarms for approximately 9 minutes and will not allow hush mode unless the unit is in alarm mode.interconnects - up to 24 kidde devices (of which 18 can be initiating).flashes once every 60 seconds to indicate battery only mode
• Sealed-in lithium battery backup - no battery replacement required over the 10 year life of the alarm. eliminates worry about removal or unauthorized deactivation of alarm.

10. First Alert BRK SC9120B Hardwired Smoke Detector and Carbon Monoxide (CO) Detector

• Keep your family safe with this hardwired smoke and carbon monoxide alarm, the battery backup means constant monitoring, even if there's a power failure
• Can connect to other compatible brk or first alert detectors, to ensure all alarms will sound when threat is detected
• Rigorously tested to meet ul standards
• Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85 decibel siren provides a clear, loud warning upon detection
• Features an electrochemical carbon monoxide sensing technology as well as an ionization sensor for smoke detection.
• First alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (based on a first alert brand trust survey in february 2018)