The answer to 'carbon monoxide detector vs' is that a carbon monoxide (CO) detector is a critical safety device for your home, while a smoke detector is designed to alert you to the presence of smoke, which could indicate a fire. Carbon monoxide is an odorless, colorless gas that can be deadly, so a CO detector is essential for detecting this hazard and protecting your family.
CO detectors are typically less expensive than smoke detectors, costing around $20-$50 for a basic model. They should be installed on every level of your home, near sleeping areas, and within 15 feet of each bedroom door. Smoke detectors, on the other hand, are recommended in every bedroom, outside sleeping areas, and on every level of your home, and can cost $10-$50 per unit.