CO & smoke alarms

What's behind our CO & smoke alarm Ratings?

Experts at our National Testing and Research Center tested 25 models in CO & smoke alarms to see which ones perform best.

We look for:

Overall score
CO alarm scoring is based on response time to lower and higher levels of CO, accuracy of digital display or voice message.
High CO levels
High CO levels rates a model's response to CO of 300 parts per million.
Low CO levels
Low CO levels rates a model's response to CO of 150 ppm.
Display/voice
Display/voice rates the accuracy of the CO level either displayed digitally or conveyed by voice message.

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Recommended CO & smoke alarms

Recommended CO & smoke alarms are standout choices with high scores. They include CR Best Buys, which offer exceptional value. When narrowing your choices, weigh features, price, and attributes that matter to you.

Recommended CO & smoke alarms

CO & smoke alarm buying guide

To find the CO & smoke alarm that is right for you, read our expert advice on which features to consider and how to find the best value.

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In addition to finding Ratings for the latest models, you can now shop online using an ad-free interface where you can buy CO & smoke alarms in a safe-shopping environment.

Learn more about our Price & Shop program

None of the smoke or carbon monoxide alarms we tested did everything well individually but you can combine various types—photoelectric, ionization, combination or dual-sensor—for optimal protection. Here are the types of carbon monoxide and smoke alarms to consider. If you're looking for information about carbon monoxide & smoke alarms, Consumer Reports is your best resource. Consumer Reports’ carbon monoxide & smoke alarm reviews will give you honest buying advice that you can trust. Use our carbon monoxide & smoke alarm buying guide to discover which features are most important to consider. We also provide unbiased Ratings and carbon monoxide & smoke alarm reviews to help you choose the best carbon monoxide or smoke alarm for your needs.

Ratings & recommended CO & smoke alarms

Carbon monoxide alarms (10)

Recommended models are standout choices with high scores. They include CR Best Buys, which offer exceptional value. When narrowing your choices among models, weigh performance, features, price, and attributes that matter to you, such as color, size, or style.