Your CO Detectors: What You Need To Know
Follow These Guidelines
At least one CO detector should be installed on each floor of your home or business. Changing the batteries in this CO detector is easy as 1-2-3, which means changing them twice a year is no problem.
Testing should be done about once a month, and batteries should be changed twice a year, according to manufacturer's instructions.
Most CO detectors have a lifespan of about five years. Follow your manufacturer's instructions for replacing yours. If you aren't sure how old it is or if it's still good, toss it and get a new one.