A furnace is a part of the heating system in which the combustion of fossil fuel and transfer of heat occurs. Furnaces can be fueled by natural gas or oil.
WHAT IT IS
A gas furnace is the heating component in a majority of systems in colder weather climates. It converts gas to heat. Another option is an oil furnace that uses oil as its fuel instead of natural gas. The main components to a furnace include burners and heat exchanger, blower and controls. Gas and oil furnaces are built to perform again and again, year after year even decades. Beyond performance, there are options for energy-efficient operation. In fact, some furnaces operate at over 96% efficiency, which means that 96% of the fuel you pay for is actually converted into heat for your home.
HOW IT WORKS
A gas furnace, or forced-air heating system, reacts when the room air temperature drops below your programmed setting on the thermostat. The silicone nitride igniter lights a burner inside the combustion chamber. The heat created is then pushed into the heat exchanger, where the air is then heated. This newly heated air moves through the ductwork and into the rooms of the house. The combustion gases used to create the heat are vented through a flue in the roof or wall.