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Question DetailsAsked on 2/5/2013

Mold in A/C ducts

Just moved into a new house (new for us but not new) to find mold in the a/c ducts. I have several questions. 1) We talked to a few companies about cleaning the ducts, one wants $1,200 and the other $3,600 and the only real difference seems to be that one takes the a/c coils out to clean them and the other does not take them out to clean them. Do they need to be taken out; 2) How can we find the true source of the problem to make sure it does not reappear; 3) Would it be better to replace the duct work rather than clean it; and 4) If we have mold in the duct work could we also have it in the walls or under the carpet, that thought scares me to no end. We are having a baby in four weeks and this has been a nightmare already!

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2 Answers


We have an A/C company in twice a year to do a check up. He cleans the coils. It's about $250 each time he does the check up. The vents get mold b/c of moisture and condensation. I usually remove those myself, Clorox them in the tub. If plastic, run them thru the dishwasher. Most carpet cleaning companies offer duct cleaning. Sears, Stanley Steamer, etc. it's usually a couple hundred bucks for that. I think it's based off the number of vents. Good luck!

Answered 7 years ago by blessed


Here in Florida ,many companies "claim" there is mold in the ducts, when it's dust and maybe some mildew.

I'd have a mold specialist come in and test and indentify what type of mold ,before spending the money on cleaning.
We have mold in the plants and trees,and the spores come into the home,but if the humidity is kept low, they do not grow. High merv rated air filters will trap spores before they get into the ducts.Minimum merv 12.

UVC lights will kill mold on the coil, not a bad idea.

If you have them cleaned, a large truck monted vaccum, like Stanley Steemer uses is the best, and will cost more then a small portable one.

The EPA, has found little to no value in duct cleaning, check their website.


Answered 7 years ago by BayAreaAC

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