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Old 09-13-2011, 10:52 PM  
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There are a lot of smells that come and go with humidity and being aired out. Hopefully you figure out what it is, so it does not smell every time the house gets humid. When in doubt, open up the windows!

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Old 10-08-2011, 05:31 PM  
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In my experience, weird musty odors that show up in humid conditions but go away with a good airing out are caused by (ugh) mold.

Before you freak out, there's lots of different kinds of mold, 99.99% are not toxic (merely irritating), all houses have a little of one sort or another, and most of it can't be seen easily.

If it comes back, try to isolate the specific area that the odor is emanating from. Mold likes porous surfaces like wallpaper or wood or carpeting best, but can hide anywhere. Try spraying the area with some enzymes, they will seep in and kill the spores dead so they don't re-bloom.

The absolute best enzyme spray, in my opinion, is this stuff they sell for pet odors and skunk odor removal called "Nature's Miracle". A lot of pet stores carry it, and if you can't find it locally you can get it cheap from Amazon.

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Last edited by MikeStan; 10-08-2011 at 05:33 PM. Reason: typo - sorry ;)
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Old 10-09-2011, 04:04 PM  
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I was just about to ask if it was mold. I could see humidity affecting the odor because the additional moisture in the air would probably cause the mold growth to explode temporarily. You can get a mold inspection for usually pretty cheap, and they can do scans to find out for sure. Have you had any recent water damage?
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