During a duct cleaning service, a professional technician will inspect your HVAC system and ductwork to assess the level of contamination. They will use specialized equipment to remove dust, debris, and contaminants from the ducts, vents, and other components of the system. The process typically takes a few hours, depending on the size of your home and the complexity of the system. After cleaning, you can expect improved air quality and a more efficient HVAC system.