The answer to 'duct cleaning not working' is that there can be several common causes, such as inadequate airflow, clogged filters, or issues with the ductwork itself. Symptoms may include poor air circulation, uneven temperatures, and increased energy bills. In many cases, DIY duct cleaning may not be effective, and it's best to call in a professional HVAC technician to diagnose and resolve the issue.
A professional HVAC technician can thoroughly inspect your ductwork, identify the root cause, and provide the appropriate solution, whether that's deep cleaning, repairing damaged ducts, or replacing the ductwork entirely. They have the necessary equipment and expertise to ensure your HVAC system is operating at peak efficiency.