Why it matters to you
In Greater Houston a gas furnace is usually paired with a central air conditioner, sharing the indoor blower and ductwork, and is often installed in a hot attic. Because it burns fuel inside your home, its venting and heat exchanger are a safety matter as well as a comfort one — and not every address has natural gas service.
Practical guidance
Change the filter on schedule and keep working carbon monoxide alarms in the home; EPA recommends a trained professional inspect, clean and tune central heating systems every year. Gas valves, burners and venting are never homeowner work, and if you smell gas, leave the house first and call from outside.