Duct cleaning involves sweeping the ducts to remove dust, dirt, debris, pests and mold, as well as cleaning the cooling coils and the blower unit. When cleaning, the ducts, wall, grills, and ceiling and floor registers are also vacuumed and wiped down.
Duct service cleaning typically includes vacuuming of the furnace and air conditioner's interior surfaces, deodorizing and sealing ducts, installing air filters and testing the central systems before and after the cleaning is performed. Some contractors also decontaminate cleaned ducts and install products to control odors within the ducts.
Homeowners can wash registers and vacuum the openings of air ducts, but it usually requires a professional with commercial-grade duct cleaning equipment to flush out dust within the central duct system.