Can a cracked furnace be serious?
A. Yes. The heat exchanger transfers heat from the gas flame of the furnace to air in the house. If the heat exchanger is cracked or has a hole in it, the fumes, including carbon monoxide, mix with the air that enters the home. As we all know, carbon monoxide is lethal. A cracked heat exchanger can be replaced. However, if the exchanger is no longer under warranty, it would be wiser economically to install a newer, more efficient furnace. Q.