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Do I need more than one COSTAR® carbon monoxide alarm in my house?

For safety purposes and by law in most states, you need one CO alarm for each level of your house.  Quantum recommends that in addition to one on each level you place one CO alarm in each sleeping area and one in your garage. If you sleep with your bedroom doors closed then you need one for each bedroom because the alarm may not wake you through a closed door according to a study first done in Australia.