The answer to 'should I get heat exchanger or' is that the choice between a heat exchanger and another HVAC system component depends on your specific needs and situation. Heat exchangers are a key part of furnaces and boilers, responsible for transferring heat from the combustion process to the air or water that circulates through your home. They are generally durable and long-lasting, but can eventually crack or wear out over time, requiring replacement.
Compared to a full HVAC system replacement, replacing just the heat exchanger is often a more affordable option. However, if your furnace or boiler is older, it may make more sense to upgrade the entire system rather than just the heat exchanger. A professional HVAC technician can assess your equipment and provide a recommendation based on factors like the age, efficiency, and condition of your existing system.