Why do I have a musty mildew type smell in my conditioned crawl space?
The house we moved into is now 11 years old. We have been here for 2 years. Just this year we started having a mildew basement type smell coming into our first floor when we run the ac. It is summer and hot. We have a conditioned craw space that was put in when the house was built. There is not junk down there. We have a heat pump and ac unit and a gas furnace in the craw. Everything was fine until this summer when our first floor began to smell like a musty basement.
We call a couple heating cooling guys. One suggested we put in an air filter in the duct in the craw that would supposedly kill all organism etc. We have done that and I dont think the mildew type smell has gone away maybe a bit reduced. The problem is that the filter itself gives off and odor. So now I smell the mildew plus some other odor. It is supposed to smell like bleach and be some kind of ozone thing. I am not sure what it smells like but my first floor definitely has an odor. We paid $900.00 for the filter and installation plus he installed a dehumidifier. He also closed off the vents to that circulate air from the crawl into our house . This was to prevent the musty smell in the crawl from getting in our house. Any how we still have an odor( musty , mildew and something else). We called a duct cleaning guy who will charge us $800.00 to clean the ducts and the coils of the ac unit.
The question is why is there a musty smell in the crawl in the first place when it was never there before? Our crawl is pretty new and nicely conditioned. So how do I find out why there is a musty smell in the craw? Also I have asked the fellow to remove the filter if things don’t improve in a few weeks. Any suggestions and thanks so much.
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