We have a small rec area, metal die cast tractors( about 8 bookshelves and 3 glass cases with a pool table and a concrete floor. What humidity level do I need to set my dehumidifier s on?
Generally between 40 and 60% is considered "ideal" for a controlled humidity environment. But you can set whatever you like; if "mold prevention" is a primary interest, "Below 70%" is suggested by this document from Florida Solar Energy Center. 60% might well prove more comfortable for people...but it will require more energy input to remove additional water.