Businesses are focused on making money while services are focused on serving. We are proud to announce that our first introduction is not a business, our first introduction is service. Crescent Duct Service as is an Air Duct Cleaning company with its core commitment to provide GTA homeowners with the best of the best heating, cooling services and that too at affordable rates. Our specialties are sales, Furnace, Dryer and Dryer Vent, Central Vacuum.