Hardwired fire and carbon monoxide detectors connect to a building’s electrical wiring, while battery-powered models operate from batteries and can suit locations without a wired connection. Wireless detectors communicate with compatible systems over a wireless connection, which can reduce the need to run signal cable during installation.

Installers should check whether the existing alarm panel supports the detector’s wired or wireless connection and communication protocol, then verify power requirements, enrollment, and zone programming. They should test smoke, heat, and carbon monoxide signals, along with any linked-alarm behavior, using the detector and panel instructions and applicable local requirements.

Install smoke alarms inside bedrooms, outside sleeping areas, and on each level of the property, including the basement. Place carbon monoxide alarms on each level and near sleeping areas, following local code and the device’s installation instructions.

When comparing fire and carbon monoxide detectors, check whether each unit senses smoke, heat, carbon monoxide, or a combination of these hazards. Match the sensing features to the installation’s safety needs and confirm that the detector works with the intended alarm system.