Proper placement of a carbon monoxide detector is important. If you are installing only one carbon monoxide detector, the Consumer Product Safety Commission (CPSC) recommends that it be located near the sleeping area, where it can wake you. Additional detectors on every level and in every bedroom of a home provide extra protection.
When considering where to place a carbon monoxide detector, keep in mind that although carbon monoxide is roughly the same weight as air, it is produced from incomplete combustion of heating and cooking appliances. If this is the case, carbon monoxide will rise with the warmer air.
Homeowners should remember not to install carbon monoxide detectors directly above or beside fuel-burning appliances since they can emit a small amount of carbon monoxide upon start-up.