Performed air duct cleaning for a residential HVAC system. Used a high-powered vacuum and rotary brush to remove dust, debris, and contaminants from the ductwork. Sealed all vent openings to create a negative pressure environment for thorough cleaning. Inspected the ducts for any damage or blockages. Sanitized the ductwork with an antimicrobial solution to improve air quality. Verified airflow and system efficiency post-cleaning.