10 Best Co Smoke Detector Combo 2025 in the United States

The First Alert BRK SC9120B-6 Hardwired Smoke and Carbon Monoxide Detector offers reliable dual protection against smoke and carbon monoxide hazards. Its hardwired setup with a battery backup ensures continuous operation even during power outages, which is essential for safety.

The inclusion of adapter plugs simplifies installation by eliminating the need for rewiring, making it user-friendly. The alarm distinguishes between smoke and CO alerts through a light indicator, adding clarity in emergencies. A single test button allows for easy regular maintenance checks, ensuring the system's reliability.

The side-load battery compartment and tamper-resistant locking brackets enhance security and ease of use. The universal mounting brackets also streamline the installation process. This detector is well-suited for those seeking straightforward, dependable protection without the need for smart technology.

The Kidde Hardwired Smoke & Carbon Monoxide Detector is a practical choice for those who want reliable and comprehensive protection against both smoke and carbon monoxide (CO) in their home. One of its standout features is the 2-in-1 detection capability, which means you only need one device for both types of threats. It’s hardwired into your home’s electrical system, supplemented by a 10-year battery backup, so you won’t need to worry about frequent battery changes or power outages.

The voice alerts are a helpful addition, making it clear whether you’re facing a fire or CO hazard, and the interconnect capability ensures that if one alarm goes off, all connected alarms will sound, providing an extra layer of safety. The enhanced sensing technology helps to reduce false alarms, particularly those that might be triggered by cooking. This unit also self-tests its internal components, but it’s still recommended to perform a manual test weekly.

The LED indicators are intuitive, showing green for normal operation, amber for errors, and red for alarms. On the downside, some users might find the installation process challenging if they are not comfortable with wiring, and the initial cost might be higher compared to battery-operated models. However, the long-term savings on battery replacements and the peace of mind provided by the 10-year warranty make the Kidde Hardwired Smoke & Carbon Monoxide Detector a worthwhile investment for comprehensive home safety.

The First Alert SMICO100-AC is a 6-pack of combination smoke and carbon monoxide alarms designed for home safety. It uses ionization sensors, which are effective at quickly detecting fast-flaming fires but can be more prone to occasional false alarms from cooking smoke. This model benefits from First Alert's Precision Detection technology, which helps reduce those nuisance alarms, making it more reliable in kitchens or near cooking areas. The alarms are hardwired with a battery backup, ensuring they stay powered even during outages, which is essential for continuous protection.

Another helpful feature is its ability to interconnect with most First Alert and BRK alarms; when one alarm detects a problem, all connected alarms sound together for quicker alerts throughout the home. The latching alarm indicator visually shows which unit triggered the alert or has a low battery, making it easier to identify the source. Installation is simplified by a mounting bracket that allows some rotation for proper alignment. The alarms come with included 9V batteries and promise long-term safety, supported by a brand with a strong reputation in home security.

One limitation is that ionization sensors may not detect smoldering fires as quickly as photoelectric types, so those seeking broader fire detection might consider photoelectric or dual-sensor alarms. Additionally, while the alarms interconnect, this functionality only works fully within the same brand ecosystem. For users wanting smart features or a digital display, this model lacks those, maintaining a straightforward design without advanced connectivity like smartphone alerts. This 6-pack is well suited for homeowners looking to protect multiple rooms affordably with reliable, easy-to-install hardwired detectors that cover both smoke and carbon monoxide risks.