10 Best Carbon Monoxide Detectors 2025 in the United States

The X-Sense Smart Smoke and Carbon Monoxide Detector Combo is designed for those seeking a battery-operated, interconnected alarm system. Its photoelectric sensor provides reliable detection for both smoke and carbon monoxide, which is crucial for early warning and safety. The product comes with a set of five detectors and a base station, enhancing coverage across multiple rooms. One of its standout features is the wireless interconnectivity, ensuring that if one alarm is triggered, all alarms sound simultaneously, which can be particularly beneficial for larger homes or buildings.

Its power source is a replaceable lithium battery, offering the convenience of wireless installation. This is great for homeowners who prefer not to deal with hardwiring, although it does mean keeping an eye on battery life, which the device helpfully alerts you about through its app. The app also offers practical features like remote test and silence, notifications for low battery, faults, and allows multiple users (up to 12) to control and receive updates, adding to its user-friendliness.

However, the requirement of a subscription for premium monitoring services might not appeal to everyone, especially those looking to avoid additional monthly costs. Installation appears straightforward, but the absence of AC power backup could be a downside for those who want an extra layer of reliability. Additionally, while its interconnected feature is useful, it relies on being within range of the base station, which could be a limitation in very large spaces.

In terms of build, the detectors are made from heat-resistant PC material, enhancing their durability. The inclusion of all necessary installation components simplifies the setup process. For those prioritizing ease of use and the ability to manage alarms via a smartphone, this product offers a modern solution, though it may not be the best fit for users who prefer a hardwired option or those who find subscription services cumbersome.

The FIRST ALERT Plug-In Carbon Monoxide Detector with Battery Backup, available in a pack of three, is designed to provide comprehensive CO detection across multiple rooms. The electrochemical sensor type is a strong point, offering accurate detection of carbon monoxide levels regardless of placement in the room. The dual power source with both plug-in and battery backup ensures continuous monitoring even during power outages, adding a layer of reliability and safety.

The loud 85-decibel alarm is effective in alerting residents when CO levels become hazardous, an essential feature for any detector. Installation is straightforward as the units can be plugged into any standard outlet; however, it’s important to place one on each floor and in each bedroom for complete protection as suggested. The single test/silence button simplifies operation, making it user-friendly.

The 7-year limited warranty and end-of-life signal chirp further enhance the safety and assurance provided by the detectors. One possible drawback is the reliance on AA batteries for backup, which requires periodic replacement. Additionally, the detectors lack advanced display features that some users might prefer for real-time monitoring of CO levels. This product is ideal for homeowners looking for a reliable and easy-to-install solution to safeguard their home from carbon monoxide dangers, especially useful for those who want a straightforward and effective alarm system without the need for complex installation or monitoring setups.

The FIRST ALERT BRK SC9120FF combines smoke and carbon monoxide detection, making it a versatile choice for home safety. Its hardwired design, paired with a battery backup, ensures continuous operation even during power outages. This model features dual sensors: electrochemical for detecting carbon monoxide, and ionization for smoke, providing reliable detection.

One of its standout features is the ability to connect with other compatible detectors, which is particularly useful for larger homes or multiple-unit installations. The 85-decibel audible alarm is loud enough to serve as an effective alert in emergencies. Installation is straightforward, thanks to its universal mounting brackets, and the design includes tamper-resistant features to keep it securely in place.

Its user-friendly aspect is emphasized by a single button for testing and silencing alarms. However, being hardwired, it requires installation in a location where electrical connections are accessible, possibly limiting placement flexibility compared to entirely battery-operated models. Additionally, while the product is highly rated and trusted, the reliance on a side-load battery compartment might be less convenient for some users compared to front-load options. Despite these considerations, the integration of smoke and carbon monoxide detection, combined with a solid reputation and trusted performance, makes it an appealing choice for comprehensive home protection.