For a small, one-level home, once CO alarm is sufficient. For a larger home or multi-level home, consider using one per floor, including the basement and a walk-in attic.

Choose a central location just outside or within sleeping areas and other living spaces. Don’t put alarms inside garages where initially high CO from car exhaust can trigger false alarms. Also don’t place them near doors or windows where fresh air can cause a misleadingly low reading.

CO detectors can be placed near the ceiling or near the floor as CO is very close to the same density as air.

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