I may be looking at this soon myself. I think humidity is a greater factor than temp but that’s just a theory. If I can’t have a full room in our new house like I’ve always had them I intend to have a climate controlled outbuilding. If I’m fortunate enough to have the shop I want I will build a separate room in one of the corners roughly 14x14 and have it well insulated and wired for 110/220. I intend to install a window unit with heat and air that will run continuously. At that size I can have all my reloading supplies with my big bench, my big tool box with the better tools, plus a couch, pub table and chairs, fridge, and an attached bathroom. Shop I want built out $50k. Big Portable building built out $10-12k
Way more info than you ask for but I’ve put a good bit of thought in this lately. I think more than anything I’m used to having “my space”.
