The most expensive and catastrophic component to fix or replace on a residential furnace is the heat exchanger. The heat exchanger is a vital metal chamber responsible for separating toxic combustion gases (such as carbon monoxide) from the breathable airflow circulating through your home. When a heat exchanger cracks due to metal fatigue, thermal stress, or age, it cannot be safely repaired and must be completely replaced. Because the labor required to dismantle the furnace is extensive, replacement costs frequently range between 1,500 and 3,000 dollars, often making it more cost-effective to replace the entire furnace unit instead.
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