Most homeowners feel safe once a carbon monoxide (CO) alarm is installed. But here’s the truth: a CO alarm can’t detect natural gas or propane leaks — and that gap could make a big difference in home safety. This guide breaks down what each type of alarm really does, why gas leaks are still dangerous even with a CO detector, and how to build a full-coverage protection system for your home. What Carbon Monoxide Alarms Actually Detect Carbon monoxide is an odorless, colorless, and tasteless gas produced by incomplete combustion — from furnaces, gas stoves, fireplaces, or car engines. Because it gives no warning smell, a CO alarm is essential for detecting it early. CO alarms use electrochemical sensors that react only to carbon monoxide molecules. That means they’re blind to natural gas, propane, or butane — gases made mostly of methane or hydrocarbons. If you’ve ever noticed a strange fuel or “gasoline-like” odor, that’s not CO — it’s likely meth...
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