Professional HVAC Air Duct Cleaning and More... Indoor Air Quality Testing (Radon, Mold, VOCs, Bacteria, Viruses, etc.) Servicing Chattanooga, TN and the surrounding areas. Our Yelp offer is for a single unit. $395 per unit- for two units the offer is $790. *This is for air duct cleaning only. If vents need to be replaced that is an additional charge. *Decontamination is an additional charge.