I've seenAlan D's solution (headband) used many times. Clients don't care how goofy you may look as long as it'sfor their benefit. I've seen some small, portable one-room air coolers that don't need windows and should fit in any treatment room, but I don't know how noisy they are. How awful to have to scramble for a workable, quick solution to save business.
Here in north Texas it's another lovely42 C day and at 1am it finallydrops to "only" 33 (that's when I do the yardwork so as to avoid heatstroke),you better betA/Cis on April through October! Iset it as low as I can without going broke and always have the table heated for client comfort. Even so, working isstill uncomfortable this time of year, but it doesn't hurt my business any.August is even hotter, because theever-present windstops until the rainsarrive in late September.