How often should CO detectors be replaced?

Every 5-10 years depending on the model. Electrochemical CO sensors degrade over time regardless of whether they have detected CO. Most modern detectors have a 10-year lifespan with sealed batteries that last the entire life of the unit.

Where should I install CO detectors?

On every level of your home, outside each sleeping area, and near attached garages. Install at mid-height on walls (CO mixes with air at all levels). Do not install in kitchens, bathrooms, or garages where false alarms are common.

Best Smart Carbon Monoxide Detectors 2026