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

The X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector offers a comprehensive safety solution for your home. Equipped with both a photoelectric smoke sensor and an electrochemical CO sensor, it ensures reliable detection of both smoke and carbon monoxide. This 6-pack model allows you to interconnect up to 24 devices, ensuring that when one alarm goes off, all of them do, providing extensive coverage and early warnings throughout your home.

One standout feature is the built-in 10-year lithium battery, which means you don't have to worry about replacing batteries for a decade. Additionally, the LCD display is very informative, showing real-time CO levels, battery status, and working status, which helps in maintaining the device easily. However, it's important to note that while these detectors support wireless interconnection, they do not have Wi-Fi capabilities. If you need Wi-Fi, you would want to look for a different model, specifically the SC07-WX. The alarms are battery-powered, which makes installation straightforward without the need for hardwiring.

The detectors are made from heat-resistant PC plastic, making them durable and reliable. If you're looking for a combination smoke and CO detector that ensures extensive coverage, long battery life, and ease of use, the X-Sense SC07-W is a solid choice.

The Kidde Smoke & Carbon Monoxide Detector stands out as a reliable and convenient choice for home safety, combining smoke and carbon monoxide detection in one device. The photoelectric and electrochemical sensors ensure accurate detection of smoke and CO, which helps minimize false alarms, especially those caused by everyday cooking. Its 10-year battery life is a major plus, eliminating the need for frequent battery replacements and the annoyance of low-battery chirps, though users should note that this refers to a limited warranty on the alarm itself rather than a guaranteed battery life.

The detector also features a self-testing function, though manual weekly tests are recommended for assurance of proper operation. Installation is straightforward, with no wiring required, making it a great option for those seeking a hassle-free setup. The LED indicators and an 85-decibel alarm provide clear and loud notifications, ensuring you are promptly alerted in case of smoke or CO detection. The inclusion of a test and hush button is practical for managing false alarms.

On the downside, the detector lacks interconnectivity with other alarms, meaning it won't trigger other alarms in the house if one goes off. This could be a limitation for larger homes where comprehensive coverage is crucial. Additionally, the product requires weekly manual testing despite its self-testing feature, which might be an inconvenience for some users. This detector is ideal for individuals looking for a cost-effective and easy-to-install safety solution for small to medium-sized homes, where interconnectivity with other alarms is not a primary concern.

The First Alert SMICO100-AC is a combination smoke and carbon monoxide detector that offers robust safety features and user convenience. It uses ionization sensor technology, which is effective in detecting fast-flaming fires commonly found in home environments. The hardwired power source with a battery backup ensures continuous protection even during power outages. This model is designed for easy installation with its Quick Connect Plug, eliminating the need for rewiring, which is ideal for those who prefer straightforward setups.

One of its standout features is its interconnectivity capability, meaning when one alarm triggers, all connected alarms will sound, providing comprehensive coverage throughout your home. This can be a crucial feature for larger homes or multi-story buildings. The test/silence button allows for regular testing and easy silencing of nuisance alarms, which is helpful for maintaining the device without much hassle. Durability is another aspect, as it complies with new industry standards aimed at reducing false alarms during cooking, which is a common issue with older models.

However, the unit uses an ionization sensor, which is less effective in detecting smoldering fires compared to photoelectric sensors. The hardwired installation might be a drawback for those without existing wiring setups or who prefer battery-only models. This product is best suited for homeowners looking for a dependable, easy-to-install, and interconnected alarm system for enhanced safety.