this post was submitted on 08 Aug 2023
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Concrete is porous as are mortar and bricks themselves I believe. Plus most basements are surrounded by a lot of earth so there is a lot of moisture to deal with. The dehumidifier will help bring the moisture down so that whatever gym equipment and whatever else is down there doesn't start to rust/mold. I've never lived in a house with a basement like that so I can only assume.
To add to this: around 50% humidity is generally a good target to set for indoors.