We had a couple of small, useless window units in our office. We had air marshall come out and install a split unit A/C. This thing is so freakin' great, I actually had to turn it down because it was too cold in the office? middle of summer, too. Mr. Marshall's service was fantastic, and fast. He came, installed it, and then it was cool. What more could you ask?
Pros: I can bare to work in the office in the summer
Cons: not having one for the shop, too