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Mold Is Growing On The Wall Under My Window Air Conditioner. Why And What Should I Do?

We usually run the window air conditioner only at night. After we were gone for an especially humid weekend (and thus obviously not using the air conditioner), we came home and noticed that the inside wall underneath the air conditioner is bubbling out and growing orangish-colored mold. I don’t know if it was there before the weekend or not. I’m wondering if the air conditioner could be causing the mold or if it’s another problem with the window or maybe even the crawl space in our basement that’s kind of below that spot. What should I do?

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  1. kansas_j
    November 2nd, 2009 at 06:05 | #1

    I love the use beach answers. Here’s the deal, beach is an effective way to remove and disinfect mold from the SURFACE only people. What about the inside of the wall? Mold can grow on the inside of the sheetrock, in the insulation and on the wood framing. Most environmental professionals will tell you that mold growth is possible only when moisture is present and that if the moisture is eliminated the mold will go dormant. However, they will also likely recommend that the mold be completely removed. The first thing that should be done is to stop the moisture problem.
    Hope this helps.

  2. tim b
    November 2nd, 2009 at 07:08 | #2

    That is a good ? sounds like your AC is draining into wall. I’ve had a little similar problem on the outside and used bleach & water mixture.

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    November 2nd, 2009 at 07:56 | #3

    first check to see where the leak is cause there is some kind of moisture coming from some where once you get that taken care of find out how long this has been going on cause you might have to replace the wood frame where the mold was forming if thats not to much of a problem then go ahead and bleach the contaminated area and you should be fine.

  4. bill l
    November 2nd, 2009 at 10:51 | #4

    you dont say if this is on the inside or outside of your house.
    if its on the inside then you have to put the ac back farther and make sure that it is tipped back out so the water drains outside.
    as for the colour of the mold as you call it . i think you may find that is really mineral deposits. . anyway you have to just make sure to have the ac drain outside and it should be on an angle

  5. **Jemma*
    November 2nd, 2009 at 11:51 | #5

    yes your airconditioner is causing this, its common. i dont know what you can do about it. you might have to speak to a professional. all i know is i work at a plumbing company and we gets called for a “leak somewhere coz mould is growing” all the time and its always right near an airconditioner – which is the cause of it. but i dont know what u can do about it.

  6. coot
    November 2nd, 2009 at 18:29 | #6

    use 1/2 cp of bleach in a bucket of hot water this should work

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