What is the main gas used in most residential gas furnaces?

Natural gas is the primary fuel used in most residential gas furnaces because it is widely available, cost-effective, and efficient for home heating. It consists mainly of methane, which burns cleanly and produces significant heat energy with minimal emissions compared to other fuels. Its infrastructure, including pipelines that transport natural gas directly to homes, makes it accessible for many residential applications.

Using natural gas in heating systems is also advantageous due to its relatively lower price compared to alternatives like propane and butane. Additionally, natural gas furnaces often have more efficient combustion processes, enhancing their heating performance and reducing environmental impact. This makes natural gas a preferred option for homeowners looking to heat their spaces effectively.