Comfort Clean - Duct Cleaning Thornhill is one of the foremost trusted air duct cleaning companies for residential and commercial duct cleaning in Thornhill and GTA. Our duct cleaning technicians are experienced in the latest procedures and most effective cleaning tools. Since 1980, Comfort Clean has been providing with leading services in air duct cleaning, dryer vent cleaning, furnace cleaning, and central vacuum systems cleaning. With our professional air duct cleaning services, homeowners and business owners will notice an immediate difference in the air quality of your home and office.