10 Best Carbon Monoxide Detectors 2026 in the United States

The First Alert BRK SC9120B-3 is a reliable choice for anyone looking to protect their home from both smoke and carbon monoxide hazards. It uses two types of sensors: an electrochemical sensor for detecting carbon monoxide, and an ionization sensor that reacts quickly to fast-burning fires. This dual-sensor approach enhances safety by covering different types of fire and gas risks.

One of the standout features is its hardwired design combined with a battery backup. This means the alarms will keep working even during a power outage, giving you peace of mind around the clock. The unit’s alert system includes an 85-decibel siren—loud enough to wake most people—and indicator lights that clearly show what kind of danger is detected.

Installation is straightforward thanks to universal mounting brackets and a tamper-resistant design, making it suitable for use in various locations around the home. The detector can also be interconnected with other compatible First Alert alarms, so if one unit senses danger, all alarms will sound, improving safety. The display is simple, with indicator lights and a single test/silence button that makes it easy to check the system or temporarily quiet a false alarm. It also comes with a dust cover to help keep the sensor clean. This 3-pack is ideal for homeowners who want dependable, long-term monitoring of both smoke and carbon monoxide with backup power, especially in larger homes or multiple rooms. Note that installation requires wiring, which might need professional help if you’re not comfortable with electrical work.

The Koabbit 4-in-1 Combination Natural Gas & Carbon Monoxide Detector is designed to monitor both carbon monoxide and explosive gases like natural gas, LNG, and LPG, making it a versatile safety device for homes, RVs, hotels, or apartments. It uses a combination sensor that provides real-time readings of gas levels, temperature, and humidity, all visible on a large digital display. The detector plugs directly into a power outlet, so you don’t need to worry about batteries, but it does require a nearby socket.

When dangerous gas levels are detected, it triggers a loud 85 dB alarm to alert you immediately. The device is compact and lightweight, making installation simple and unobtrusive. One downside is that it must remain plugged in, which may limit placement options in some areas of your home. Also, while it monitors multiple gases and environmental factors effectively, it lacks battery backup in case of power outages.

This product is ideal for anyone looking for a multi-purpose gas detector with clear digital readouts and strong alert features, especially if you have natural gas appliances or want added safety beyond just carbon monoxide detection.

The Kidde Carbon Monoxide Detector offers a straightforward, plug-in design with a handy 9-volt battery backup to keep it running during power outages. It uses an ionization sensor, which is effective at detecting carbon monoxide and is common in many detectors. The digital LED display is a useful feature, showing you the current CO levels in your home, which goes beyond basic alarms and adds peace of mind. The loud 85-decibel alarm ensures you will hear it clearly if dangerous carbon monoxide is detected.

Installation is very easy—just plug it into any standard 120V outlet, and it can also be placed on a tabletop if needed. The included battery backup and peak memory feature, which records the highest CO level detected or last test time, provide extra safety and convenience. This 2-pack is a great value for covering multiple rooms or floors. One minor drawback is that the sensor is ionization-based, which is generally good but some users prefer electrochemical sensors specifically designed for CO detection.

Also, the unit is designed for indoor use only and has an operating temperature limit of 100 degrees Fahrenheit, so it’s best suited for typical home environments. With a strong reputation, solid safety features, and easy installation, this detector is a good fit for homeowners who want reliable, user-friendly carbon monoxide protection without complexity.