How many carbon monoxide detectors should I have in my home?

So how many carbon monoxide detectors should you have in your home? The National Fire Protection Association (NFPA) recommends that you should have a carbon monoxide detector centrally located outside of each separate sleeping area in the immediate vicinity of the bedroom. For added protection, you should have additional carbon monoxide detectors in each separate bedroom and on every level of your house, including the basement. Some states now require that you have a carbon monoxide detector in each bedroom of the house. If you install only one carbon monoxide alarm in your home, locate it near or in your bedroom.