The answer to 'how long does heat exchanger last' is that a properly maintained heat exchanger in a residential HVAC system can typically last 15-20 years. The heat exchanger is a critical component that transfers heat from the combustion process to the air circulated through the home. It is designed to be durable, but its lifespan can be impacted by factors like the unit's usage, maintenance history, and environmental conditions.
Over time, normal wear and tear can cause cracks or holes to develop in the heat exchanger, which compromises its efficiency and safety. Regular professional maintenance, like annual tune-ups, can help maximize the heat exchanger's lifespan by identifying and addressing any issues early on. If the heat exchanger is nearing the end of its expected lifespan or shows signs of deterioration, it's important to have a qualified HVAC technician inspect it and recommend replacement if necessary for safety and performance.