The answer to 'how long does heat exchanger last' is that a typical heat exchanger in a furnace or HVAC system can last 10-15 years with proper maintenance. Heat exchangers are a critical component that transfer heat from the combustion process to the air circulated through your home. Over time, the metal in the heat exchanger can become corroded or cracked, reducing its efficiency and potentially creating safety issues if not replaced.
Regular annual maintenance and inspections by a qualified HVAC technician can help extend the lifespan of your heat exchanger. They will check for any cracks, corrosion, or other damage, and recommend replacement if necessary. Proper airflow, ventilation, and regular filter changes can also help maximize the heat exchanger's longevity.