I know most of you out there have been approached by an AC tech in your home who tells you that you have mold in your duct work. He then tells you that the black stuff behind your air vents is mold but the truth of the matter is that black stuff is painted fiberglass duct board which was manufactured that way so you don't see anything behind the air vent! Any question you may have about what an AC tech has told you can be answered honestly here at Kennedy Cooling & Heating. So before someone gets the best of you call us so we can get what is best for you.