I have plug-in dehumidifier (its about 4" x 6" x 2") that hangs in my gun-safe. Its been great thus far. When the desiccant on the inside is saturated I take it out, plug it into the wall, and in about 24 hours it ready to use again. Its good for about a month at a time.
Most of my collection has been moved to a couple safety deposit boxes however. When I go for a "visit" I pick up a bag of those disposable desiccant sacs and change them.
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