10 Best Smoke Detector Carbon Monoxide Detectors Combo 2025 in the United States

The Kidde Smoke & Carbon Monoxide Detector 2-pack is a practical choice if you're looking for an easy-to-use device that covers both smoke and carbon monoxide detection. It combines photoelectric and electrochemical sensors, which helps it detect smoke from fires and dangerous carbon monoxide gas effectively. One big plus is its 10-year battery life — you won't need to worry about changing batteries or annoying low-battery chirps for a decade, which also saves money over time. Installation is simple since it’s battery powered and wireless; just mount it on the ceiling and click it into place. It has clear LED lights to show its status, so you can easily see if everything's normal, if there's a problem, or if an alarm is sounding.

The 85-decibel alarm is loud enough to alert you even if you’re in another room. It also features a test and hush button, handy for checking the alarm works or silencing false alarms, which are less common thanks to its improved sensing technology that reduces alerts from normal cooking smoke. However, it doesn't support interconnectivity, so multiple alarms won't communicate with each other, which might be a drawback if you want whole-home coverage with linked alerts. Its operating conditions are quite standard, suitable for typical home environments.

This detector is ideal for homeowners who want a reliable, low-maintenance, combo smoke and CO alarm without complicated wiring or smart home features. It has a solid warranty and customer feedback supports its dependable performance, though after 10 years, the entire unit needs replacing, not just the battery.

The First Alert SMCO100 is a battery-operated combo alarm that protects against both smoke and carbon monoxide, making it a practical choice for home safety. It uses photoelectric sensors, which are especially good at detecting smoldering fires and reducing false alarms from cooking. This means fewer annoying nuisance alarms compared to traditional models.

Since it runs on 2 included AA batteries, installation is simple and you don’t have to worry about wiring, though you will need to replace batteries periodically. The alarm includes a test/silence button for easy checks and temporarily silencing false alerts. It also has an end-of-life warning that notifies you when it’s time to replace the unit, helping to ensure ongoing protection. The 3-pack offers good value for covering multiple rooms or floors. However, since these smoke/CO detectors are not interconnected, alarms won’t sound simultaneously throughout the house if one detects danger, which could be a drawback for larger homes.

This First Alert model provides a reliable, user-friendly option for those seeking straightforward, battery-powered smoke and carbon monoxide detection without extra complexity.

The Kidde Hardwired Smoke & Carbon Monoxide Detector combo offers reliable dual protection by detecting both smoke and carbon monoxide with photoelectric and electrochemical sensors. This combination ensures early warning of fires and CO presence, which is vital for home safety. It connects directly to your home's electrical system (hardwired) but also includes 2 AA batteries as backup, so it keeps working even during power outages. The detectors can be interconnected, meaning if one alarm goes off, all alarms in the system will sound to alert everyone in the house. The alarm is loud (85 decibels) with LED lights to grab your attention quickly.

One smart feature is its enhanced sensing technology that helps reduce false alarms, especially those caused by cooking smoke, which can be annoying in kitchens. Testing and silencing the alarm is easy with the test/hush button. It meets current safety standards and comes with a 10-year warranty, reflecting its expected lifespan and durability. The package includes three detectors, mounting hardware, and batteries, which is handy for whole-home coverage.

A limitation to note is the upper temperature limit of 100°F, which is typical but means it may not be suitable for very hot environments like attics. Also, installation requires hardwiring, so if you’re not comfortable with electrical work, professional help may be needed. The size and design are standard and unobtrusive. This product is ideal for homeowners seeking a dependable, interconnected system that covers both smoke and carbon monoxide detection with backup power and reduced false alarms.