Re: Reloading in a garage
I've been reloading in a non-insulated garage for about 1.5 years, and I think it's the pits. Prior to that, I had an unfinished basement all to myself, which was FANTASTIC in comparison.
I'm in Michigan, and a "typical" summer day is 85-90º, 75-80% humidity. These conditions cause everything that is steel, to rust. You can't keep on top of it. I tried storing my dies in ziplock baggies with a nice coat of silicone spray or WD40, which helps, but it's a pain to clean them up to use them. Then, if you don't put them away immediately following your reloading session, they rust. Well, its obnoxious to "store" your dies as if they're going to be put away for a long time, only to pull them back out the next day.
Spring/Fall aren't too bad.
Winter is actually not too bad except for the cold. It's pretty dry and things don't rust. One of those "Heat Radar Dish" things pointed at you actually keeps you pretty comfortable.
Bottom line:
You do what you gotta do, but no HVAC is last resort.