So I have made my own air conditioning for our office.
It's not difficult to do, and works very quickly. We keep bottles of chilled tap water in the fridge, ready for a quick cold drink. I've poured most of a bottle into a bowl, and put it in front of our big room fan. The fan blows air over the water, which evaporates and cools the air around it. The result: a nice cool stream of air on the backs of our knees.
Ah, the wonders of physics.