When I lived in Florida the central air kept my house from getting too humid inside. I rarely ever opened the windows down there. Now I live in Iowa where I find the humid conditions to be almsot nil except during are rainy season. Then I turn my dehumidifyer on. I have whatever it's called gadget that shows me the humidity in the room I keep all my machines and if its too dry I fill a washtub with hot water when I go to quilt and/or sew so I don't get zapped. In my garagae worshop with power tools I keep a cover over all my power machines to keep the dust, bugs and moisture away from them. Did this in Florida and it seemed to work find. No rust on any of my tools.