How often should a carbon monoxide detector be replaced?
The average life span of many carbon monoxide detectors is about two years. Be aware that the “test” feature on many detectors checks the functioning of the alarm but not the ability of the detector to detect carbon monoxide. Some detectors last longer than others, indicate when they need to be replaced, and have power supply backups. When purchasing a carbon monoxide detector, consider not only the number and type of possible carbon monoxide sources, but also the construction of the building. Newer buildings may have more airtight construction and may be better insulated, which makes it easier for carbon monoxide to accumulate.