The answer to 'duct cleaning making noise' is that there are several common causes for noises during duct cleaning, including loose debris being dislodged, air pressure changes, and issues with the cleaning equipment. Symptoms may include banging, whistling, or other disruptive sounds. The solution often involves adjusting the cleaning process or addressing underlying duct problems.
If the noises are persistent or you're unsure of the cause, it's best to have a professional HVAC technician inspect the system. They can identify the source of the problem and recommend the appropriate repairs or cleaning methods to resolve the issue safely and effectively.