[widebody911]

I have a similar situation. I have a big 110v A/C unit (don't bother with the units that also provide heaters) and it keeps my 25x25x12 shop at a reasonable temp.

Another thing I did in my shop which you might consider is a whole house fan type setup. On days I know I will be in the shop, I run the fan for an hour or so at 0-dark-thirty to pull in some cold air; this makes a huge difference later in the afternoon. The fan also helps with evacuating noxious fumes