I have a split entry ranch home. There is a crawl space under the
floor of the foyer that retains a musty odor.
The area not heated or normally open to the rest of the house.
There is an access panel at the back of a coat closet on the basement
level. The floor of the area is basement level. The outside wall is
concrete block and attached to it is a dirt filled concrete block and
concrete capped porch landing.
There is no evidence of water intrusion but I'm sure that there is
some moisture from condensation. I have been considering venting it by
opening up a hole in the wall between it and the garage and installing
a small fan.