What's the floor in your shop like?
Standard concrete slab - probably 6-8" thick.
dig a tunnel, down and right out and as far along your property as you can. I hear ground source stuff can be great if you go deep enough (but not too deep obviously!)
Hopefully you're kidding - definitely not feasible; even if I could get thru the slab cheaply (I'd probably have a heat stroke if I did it myself), here in Arizona if you go down 3-4 feet in many areas, you hit a layer of caliche, which is kinda like natural concrete, in varying thicknesses (in some areas it is so thick - several feet - you need dynamite to remove it). I honestly don't know my area, whether there is a layer, how deep it is, thickness, etc. It would likely be more work than its worth; it would be cheaper to have an A/C installed.
I've basically switched back to the swamp cooler; however, I can't use it much now that the humidity is so high (right now it is 88 F and 49% humidity - it rained earlier). We're in the "ugh" season, otherwise known as monsoon (even with A/C it feels bad).
