AC duct cleaning involves the thorough cleaning and sanitization of the air ducts in HVAC systems. This service is important to maintain the efficiency of the HVAC system, improve indoor air quality, and remove any potential sources of mold or other contaminants. Duct cleaning may include removing debris and dust from the ducts, cleaning and disinfecting the ducts, and sealing any leaks or holes in the ducts to prevent future contamination. It is usually recommended to do this service every 3-6 months depending on the usage and the environment of the building