Suggestions on how to keep my shop cool...

Dude, is it raining inside?

No, but there is an evil looking black mold growing on the radiator in my office.

That's what you get in Alabama in the summer time, especially when you turn off HVAC at night and on weekends. At the moment humidity is 18% worse in my office vs. outside (66% vs. a relatively low 48%).

-j