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As a mom of three, she's written about parenting and family life for At Ease Magazine, Legacy, and Monterey Bay Parent, where she was a monthly columnist. Verywell Health articles are reviewed by board-certified physicians and healthcare professionals. These medical reviewers confirm the content is thorough and accurate, reflecting the latest evidence-based research.
Read on to learn how to choose a model, and see why the units tested met our standards to be considered among the best carbon monoxide detectors available. TheFirst Alert 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. Still, the bright blue backlit LED display shows real-time carbon monoxide levels, battery life, and operational status, plus the unit self-tests its battery and sensors every 60 seconds.
Alert Pro: Budget pick
The Kidde KN-COB-DP2 Carbon Monoxide Detector is fast to install—just plug it into a standard electrical outlet. This model has a 10-year life span that surpasses the 5- or 7-year life expectancy of some other plug-in carbon monoxide detectors. The First Alert Battery-Operated Carbon Monoxide Detector uses a proven form of detection in the form of an electrochemical sensor. The unit is powered only by a 9-volt battery, so you’re not limited on where to place the carbon monoxide detector because of outlet proximity or electrical wire connections. While this product represents a good value, it’s worth noting that it should be replaced every 5 years, while some other models offer a 10-year life expectancy. An end-of-life signal chirp and low-battery beep round out the features of this simple unit.

Carbon monoxide detectors that can be programmed or wired with other alarm devices in the home through radio-frequency, Wi-Fi, or direct wiring are considered interconnect-capable units. To see which home security systems include CO detectors with their monitoring plans. Klein Tools' (about $140) handheld carbon monoxide monitor is a diagnostic device an HVAC installer or mechanic would use. But while it's ultra-sensitive, it's not a safety device for the average homeowner. X-Sense (about $40) is a recent up-and-comer selling attractive CO alarms that compete with long-time leaders like First Alert and Kidde.
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To determine the type you need, remove the detectors in your home from their mounts. If there are wires connected to them that run into the wall or ceiling, you need hardwired detectors. However, laws vary by state when it comes to the requirement of detectors in hotels, apartments, or rental properties.
A smart function that's safety-related is this model’s ability to send an alert to your smartphone if it detects a threat from carbon monoxide or smoke. This means you have an instant heads up wherever you are—in the backyard, at the office, or away on vacation, when a potentially dangerous situation has developed at home. The smoke and carbon monoxide detectors can be a little difficult to connect to Wi-Fi. Looking for a CO detector that is both easy to use and provide a loud 85dB warning signal?
Google Nest Protect Smoke and Carbon Monoxide Alarm
Almost similar to AZ 7755 in terms of price and accuracy, SA1200P has a good quality to price ratio. However, the monitor has to be plugged in during measurement and does not allow for exporting of data. That being said, SA1200P has data visualisation options and the option of background calibration, which are always useful.

To help you make the decision on which CO2 monitor to choose, here’s our 5 top performing CO2 detectors for your home or office. Smart Air is a social enterprise that creates simple, no-nonsense air purifiers and provides free education to protect people’s health from the effects of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.
When researching picks for this list, she compared various types of carbon monoxide alarms, including options with and without smoke detection. She evaluated the most popular models based on the power source, display options, and any additional safety or smart home functions. The type of carbon monoxide detector you select depends on your monitoring needs.
Below are the best CO2 monitors that are in line with the above factors. We had high hopes for the second generation First Alert Onelink Smoke and Carbon Monoxide Detector, but this model had many of the same problems as the original version. This updated alarm is now compatible with Android phones (the first generation wasn’t), but the app still crashes and the pairing process is still clunky and glitchy.
What's more, this customer-loved device has more than 3,000 5-star reviews, so you can trust that you're making a smart purchase. Combination units are multipurpose, monitoring carbon monoxide levels while also detecting smoke or explosive gases. The benefit of combination units is that they take a lot of the planning and guesswork out of building a fire safety system. The downfall is that for optimal use, combination carbon monoxide detectors shouldn’t be placed close to gas or oil-fired appliances. In that situation, a stand-alone smoke detector is best used with a separate stand-alone carbon monoxide detector installed farther away.

Dr. Johnson-Arbor suggests that carbon monoxide detectors should always be placed in or within 10 feet of any sleeping area. With this parameter in mind, the Kidde Nighthawk is an excellent choice. You won’t have to worry about checking the battery or sensors, as the Nest Protect runs diagnostics 400 times daily. It also doubles as an optional hallway light that’s triggered when you walk underneath. The device also comes in a hardwired version if you prefer that to batteries. Prevention can cost as little as $20, but with so many carbon monoxide detectors on the market, it can be tough to figure out which best suits your home.
Review10Best compares the best carbon monoxide detectors in the UK and selects the one by Kidde as the best carbon monoxide detector. By considering the top list of carbon monoxide detectors, you can find the best carbon monoxide detectors and save time shopping online. It took the X-Sense Wi-Fi Smoke Alarm several seconds longer to detect smoke than the Nest Protect, but alerts were sent quickly once the siren started to sound. The 85-decibel tone is loud enough to hear from a room over, but it is harder to hear if you’re across the house or in the garage.
Smoke alarms generally have one purpose and that's to alert you of a fire. But did you know that you can make your humble abode even safer thanks to smart smoke and carbon monoxide alarms? Not only do they send notifications to your phone, but most of them are pretty easy to install, too. Whether it's smart water leak detectors or smart thermostats, turning your living space into a smart home is both safe and convenient. In the lab, we expose detectors to both flaming fires and smoldering, smoky fires to see how well they detect smoke and fire.
This carbon monoxide detector is another customer favorite, with an average 4.7 stars from more than 18,000 reviewers. The plug-in unit is well-priced, fairly compact, has a peak memory feature that records carbon monoxide readings, and includes an 85-decibel alarm. In the event of a power failure, two included AA batteries serve as a backup.
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