Black mold in an HVAC system isn't unusual, especially in the summer months when the A/C is running and taking humidity out of the air. The A/C coils are constantly wet, and in the dark environment of the HVAC system mold grows rapidly. Last year we had our system inspected by a contractor and he said the same thing these people were told. I had him show me the mold, and sure enough it was there -- very bad. We had bought the house pre-owned one year earlier and evidently the previous owner had not had the system cleaned -- maybe ever. The contractor cleaned the system for about $150. It took him over 2 hours, and he did a good job. He suggested I install a UV light to make sure mold doesn't grow. He quoted me over $1000, and I thought that was way too steep. Since then I purchased a UV light system for $150 and installed it myself. I've opened the HVAC up a few times since I installed the UV -- no mold! I also have an Aprilaire air cleaner.
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