Considered a major appliance, a furnace is permanently installed and provides heat to your interior space. It creates heat through air, steam, or hot water, and is commonly fueled by natural gas.

Components of a modern furnace:

  • Burners – This is were the flame originates.
  • Heat exchanger – Drawn to the heat exchanger when the burners create the flame.
  • Draft inducer – After it’s cooled by the heat exchanger, the gases get pulled into the draft inducer.
  • Venting – Pushed out by the draft inducer, the vents are where the air enters the space which gets cooled.
  • Controls – Includes safety devices
  • Blower

How heat is distributed:

  • Distribution – An intermediary distribution system transfers the heat from the furnace to the living space. The furnace is considered a boiler if the distribution is through hot water or steam. The thing about boilers is that if they break down, they affect not only heating but your hot water as well.
  • Circulation – Known as forced-air heating, many modern furnaces circulate air to rooms with a fan that pulls cool air back into the furnace. Any resistance from the ductwork is overpowered by the fan.