A couple questions for the knowledgeable readership........ I just bought a big gun safe that is going to sit on a concrete slab, under which is just ground/dirt/earth. At the present time, it is in an unheated area of the property. The exterior walls are reinforced cinder block. Should I put some sort of insulating mat under the safe before I bolt it to the concrete? Even maybe just a 3/4" sheet of plywood? This is in the desert of the Southwest USA, very very low humidity, but it does see large temperature variations throughout the year, and even during a single day: it gets well over 100 degrees regularly in the summer (often cooling off 20-30 degrees at night) and can get down into the 30's - 40's at night in the winter. I may, at some point in the future, decide to enclose the space that the gun safe sits in, and make it into a "gun room", it'd be probably end up being about 8' x 16' dimensions. If I do this, I might go ahead and put a "mini-split" type air-conditioning system in it, for temperature and humidity control. If I ran this system year round, what would be the ideal temperature to run it at (year round?) for this room? Any other tidbits of info that anyone cares to add on this topic would be greatly appreciated!