What does a heat exchanger do in a gas furnace?

A heat exchanger in a gas furnace plays a crucial role by transferring heat from the combustion chamber to the air that circulates through the home. When gas is burned inside the furnace, it creates hot gases. The heat exchanger absorbs this heat and warms the air that is then blown through the ducts and into the living spaces. This process is essential for the efficient operation of the furnace, ensuring that the energy from the gas fuel is effectively utilized to generate warmth for heating purposes.

The heat exchanger is designed to promote maximum heat transfer while keeping the combustion gases separate from the airflow that enters the home, thus maintaining safety and comfort. By efficiently transferring heat, the heat exchanger helps optimize the overall performance of the furnace and contributes to effective heating.