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In my case, it's a 50 year old house with block type walls. I have a persistent musty odor which I suspect might be coming from the floor sewer drain. Also, I have a certain amount of run-off resulting from large trees whose roots have raised the ground surrounding the house.
Still, despite the dehumidifier, I have the smell -- even though there's very little visible dampness anywhere.
Just some food for thought for you, although I wish I had a better answer for you.