The answer to 'carbon monoxide detector replacement schedule' is that carbon monoxide (CO) detectors should be replaced every 5-7 years, or as recommended by the manufacturer. CO detectors have a limited lifespan and can become less effective over time as the sensors degrade. Replacing them on a regular schedule ensures they will continue to accurately detect dangerous levels of this odorless, colorless gas and alert you to potential hazards.
Most CO detectors have a lifespan of 5-7 years, so it's a good idea to replace them every 5 years to be on the safe side. You should also replace any CO detector that is damaged, not functioning properly, or has reached the end of its recommended lifespan. Regular testing and maintenance of your CO detectors is also important to ensure they are working correctly.