As my sewing room is in the basement of a 1900 house its not insulated as the newer home are. I keep one of those gadgets that gives you the temp and humidity near my machines so I know. It gets pretty dry in the winter time so I fill a washtub with super hot water to put moisture into the air so I don't get zapped plus I have rubber mats along my quilt machine. For summer time I keep a floor fan running most the time and have my dehumidifier running at 50% humidity. So far so good and I've been down here for the past 10 yrs now.