Apparently window air conditioning units don't need windows anymore. Maybe they're actually sucking cool air from the restaurant into the hot kitchen. Or maybe they're just dumb. Whichever is more likely.
"A few years ago I got tired of laptop fans that slide around, and didn't cool very well. This was my husband's solution. $10.00 clip fan, red duct tape, and an old foam wedge laptop desk. Best fan I have ever used."