The answer to 'heat exchanger repair cost' is that the cost can vary significantly depending on several factors. As a general range, heat exchanger repair typically falls between $500 to $2,000 for most homes. The specific cost will depend on the type of HVAC system, the extent of the damage, the age and model of the unit, and your location.
For example, repairing a cracked or damaged heat exchanger in an older furnace may be on the lower end of that range, while replacing a complete heat exchanger in a high-efficiency system could be on the higher end. Labor costs, any necessary part replacements, and the complexity of the repair also influence the final price.