Never worried about humidity. I repurposed an old, big, Mosler safe almost twenty years ago. It was the safe for an automobile dealership near here, originally. I removed the secondary steel doors and the wooden drawers, etc., then carpeted the inside. I then drilled a hole through the floor (about 8-9" thick) to run the cord for the Golden Rod I bought. it lays on the floor of the safe, toward the front, always on. I have had guns in it for all these years with no humidity monitoring. Never one bit of a problem, even though the safe is in a mostly unheated room with a concrete floor.
It stays warm inside without any hint of moisture problems, even though there are times when the outside of the old safe is totally wet with condensation. I've never understood how the warmth inside eliminates, or at least renders harmless, the humidity. I live in a very humid environment.
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