I had a dark discoloration appear near two A/C vents, so I took off the cover and found what looked like mold to me . Rather than trust someone to tests it who may or not be acting in my best interest, I purchased a mold detection kit from Amazon and tested it vents myself with sticky tape provided in the kit. It was around $35.00 (five years ago), and I mailed the samples to a lab in an envelope provided. The analysis came back about ten days later and showed a couple kinds of mold present, but not black mold or any other "dangerous" mold. But the lab did say that I should contact a mold abatement company to have it removed. I did so, but I didn't have to worry about a company ripping me off since I already knew what it was. The mold abatement company confirmed what I had, and it cost me about $800.00 to have the entire house treated via the A/C system, they physically cleaned out the vent lines too, and treated the lines and air handler so it wouldn't return. I haven't had a problem since. They gave me a five year warranty, which recently expired. I was happy with the service.
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