Coitenly true. But for reasons outlined below, my ground and upper floors seem to be a whole lot more moist than my basement, where a family room and my shops are located. I do have 2 de-humidifiers down there too, but only run them in the more humid times of the summer. Like now. No rust on all my machine surfaces.

I think it helped as I was totally remodeling the family room 7 years ago, complete tear out and replace, I coated the floor slab with some high tech polymer sealer, and painted all the concrete walls in the whole basement with heavy, vapor barrier paint. That could of course explain why it is so dry down there, relatively. That and good draining, sandy soil here.

I keep my bikes down there. There's no getting a bike, or anything larger than the 2 X 3 access port, into my attic. It's filled with about 2 feet of blown in insulation anyway. What a mess !