Which is a benefit of using a direct-vent furnace?

A direct-vent furnace draws air from the outside for combustion and expels exhaust gases back outside through a sealed vent system. This design leads to improved heating efficiency because the furnace operates using the oxygen-rich air directly from outside, which allows for more complete combustion compared to systems that pull air from the home.

In addition, because the combustion process is contained and utilizes outdoor air, it minimizes heat loss that can occur with traditional systems that use indoor air, leading to more efficient heating and reduced energy costs. This efficiency also contributes to a healthier indoor environment since the air quality is less affected by combustion gases that might otherwise be present in the home's air.

While reduced installation costs, lack of need for electrical power, and absence of external combustion air might seem beneficial, they do not directly contribute to the core advantage of why direct-vent furnaces are prized for their performance and efficiency in heating applications.