What is the primary function of a furnace?

The primary function of a furnace is to heat air and distribute it throughout a building. A furnace operates by burning fuel—such as natural gas, propane, oil, or utilizing electricity—to generate heat. This heated air is then circulated through the home via a network of ducts and vents, ensuring that all areas receive adequate warmth during colder months.

While cooling and other functions are essential for overall climate control in a building, these tasks are generally handled by other systems, such as air conditioning units or dedicated ventilation and humidity control systems. A furnace’s specific role focuses on heating, making it vital for maintaining comfort in residential and light commercial spaces during winter.