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

The X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector (SC06-W, 6-Pack) offers a robust solution for home safety. Its dual protection with photoelectric smoke and electrochemical CO sensors ensures comprehensive hazard detection. The standout feature is its wireless interconnectivity, allowing all alarms to sound simultaneously if one is triggered, which can significantly enhance safety throughout a home.

It’s important to note that this device doesn’t support Wi-Fi, which limits remote monitoring capabilities. The 10-year sealed battery is a strong point, offering a long-term power solution without the need for frequent battery changes, though it will give a low battery warning towards the end of its lifespan. The inclusion of a test/silence button is a practical touch, making it easy to check functionality or silence alarms if needed.

This model supports full home coverage by linking up to 24 units, ensuring extensive protection. Since it’s battery-powered, there may be concerns about battery disposal, and the lack of Wi-Fi means users can’t receive alerts on their phones. This detector is ideal for users seeking a reliable, interconnected alarm system with long battery life, but it may not suit those looking for smart home integration features.

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 BRK SC9120FF is a reliable hardwired smoke and carbon monoxide detector that comes with a battery backup to keep it working during power outages. It uses two types of sensors: an electrochemical sensor specifically for carbon monoxide and an ionization sensor for detecting smoke. This combo means it can quickly alert you to both fire and dangerous gas, which is important for home safety. The alarm is loud at 85 decibels, ensuring you can hear it clearly in an emergency. One helpful feature is the indicator lights that show whether smoke or carbon monoxide has been detected. It also can connect with other compatible alarms in your home, so if one senses trouble, all alarms will sound together, giving broader protection.

Installation is made easier with universal mounting brackets and tamper-resistant locking, though since it’s hardwired, it may require some basic electrical work or professional installation. The device is designed to last a long time, supported by a 10-year limited warranty, and includes a 9-volt battery for backup that you’ll need to replace periodically. The unit is straightforward to test and silence with a single button. While this alarm may be more complex to install compared to battery-only models, it is a solid choice for homeowners looking for dependable, continuous protection combining smoke and CO detection with the added safety of battery backup and interconnectivity.