Interesting post, so my 2 cents,
I built this fabulous 30x40 garage in 91 (it would solve all the issues) It is full of politely, (stuff).
I am in the process of building a 16x16 wood only shop and a major requirement for me is Air-conditioned space.
Summer heat is brutal, as this past summer the larger building averaged 118 with the windows (and doors) open and 130 up in the rafters. (AC in the larger building would be like having 2 houses.)
You get about 5 minutes before the sweat starts drippiing off your hands.....
Oh yeah, it doesnt make any diff if the mess in the basement or in the garage I still hear about it... Gotta love the bows.....