Which gas is often used in residential heating systems?

Propane is frequently utilized in residential heating systems due to its effectiveness as a fuel source. It is a highly efficient energy option, providing a significant amount of heat per unit of energy compared to many other fuels. Propane is also easily transportable and can be stored in tanks, making it suitable for areas without direct access to natural gas pipelines. This flexibility allows homeowners to efficiently heat their spaces, such as furnaces, boilers, and water heaters, leading to its prevalence in residential applications.

Other gases mentioned are not typically used for heating in residential settings. Nitrogen, for instance, is an inert gas that does not combust, making it unsuitable for heating purposes. Carbon dioxide is a byproduct of combustion and is not used as a fuel, while argon is a noble gas that similarly does not support combustion and is primarily used in applications like lighting and welding, not heating. This distinction highlights why propane stands out as the preferred choice for heating in homes.