Personally, I wouldn't do my reloading in a non-climate controlled place if I had the option of staying indoors, and that goes double for places that get really hot & humid such as Louisiana. Unless you are really hurting for space, I'd take a smaller spot inside over a huge spot in the garage for the operation.
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.