The answer to 'how much to fix heat exchanger' depends on several factors, but typically ranges from $500 to $2,500 or more. The cost can vary widely based on the type and size of your HVAC system, the extent of the damage, the complexity of the repair, and your location. Replacing a heat exchanger is often one of the more expensive HVAC repairs, as it involves replacing a critical component that is essential for safe and efficient heating.
It's important to have a qualified HVAC technician inspect the issue and provide a detailed estimate. They can assess the full scope of the repair and give you a more accurate cost. Getting multiple quotes from local HVAC companies is recommended to ensure you get a fair price.