What common safety device should be installed in areas using gas appliances?

A carbon monoxide detector is essential in areas where gas appliances are used because it specifically monitors for the presence of carbon monoxide, a colorless, odorless gas that can be produced by incomplete combustion of fossil fuels. Gas appliances, like furnaces and water heaters, can sometimes malfunction or be improperly vented, leading to dangerous levels of carbon monoxide in the living space. Installing a carbon monoxide detector helps ensure that any leaks or dangerous concentrations are detected early, allowing for timely action to be taken, preventing potential poisoning or fatalities.

Smoke detectors, while critical for fire safety, do not specifically address the risks associated with gas appliances. Thermostats are important for temperature regulation but do not monitor air quality or gas safety. Humidity sensors measure moisture levels in the air and have no relevance to gas appliance safety. Therefore, a carbon monoxide detector stands out as the most relevant safety device in this context.