Gun safe in unheated room or garage?

[Sled]

I'm moving soon to a place that doesn't have many options for storage. The 42" wide fat boy will need a home and so far the only places I can fit it in will be an unheated storage room or the garage which is moderately insulated but will have high humidity with parked vehicles dripping snow off in the winter. I will have power in both locations to run a golden rod if need be. The storage room will be tight but more secure than the garage. I can hang a curtain to block the view of the safe in the garage so people don't see it with the garage door open. The other option might be to sell it and run a couple cabinets or smaller safes but I really like the one I have now. Any thoughts?

 

[Pony Soldier]

I can't speak for humidity as we don't have much. A lightbulb in the safe might be an option.

I don't have a safe. I just built a hidden cabinet behind one of the closets on an interior wall. It seems to work well.