I'll second the Mini-split unit. I got a Senville off of ebay that works great. I mainly bought for my basement for the heating aspect of it. But the AC works great and you can just run it as a fan. Went up really easily, my main issue was drilling a 4" diameter hole through 8 1/2" of concrete. That took an hour and $125 bit, but it is done. I'll probably add one in by main shop next year.
Oh, I tried one of those roll around portable AC units a few years ago. While it works, it is a big hassle and always in the way. Getting exhaust hot air out was always the main issue.
Woodworking, Old Tools and Shooting
Ray Fine RF-1390 Laser Ray Fine 20watt Fiber Laser
SFX 50 Watt Fiber Laser
PM2000, Delta BS, Delta sander, Powermatic 50 jointer,
Powermatic 100-12 planer, Rockwell 15-126 radial drill press
Rockwell 46-450 lathe, and 2 Walker Turner RA1100 radial saws
Jet JWS18, bandsaw Carbide Create CNC, RIA 22TCM 1911s and others