Air that is about 50% humidity and 75° F is considered quite comfortable by most people. The air coming out of an evaporative cooler is closer to 100% humidity so a person directly in the out flowing air on a 102° F day would feel a very pleasant near 100% humidity 75° F breeze. It isn’t quite that simple however because the building itself is subjected to hot sunshine on the sunlit side and reaches temperatures of 180° F and on the shady side will be subjected to hot 105° F air plus reflected hot-light from the surrounding hot terrain. So the interior of the building will rise to somewhere between 105 and 180. Hopefully there is insulation all around the walls and ceiling of the building and it won’t get nearly that hot but it will become uncomfortable. Below is a swamp cooler diagram from