Answer:
Well I remember back in the renaissance or Shakespearean era, around when the black plague started theaters weren't indoors but rather outdoors. If you go that far back I guess people weren't kept cool but you have to more specific.
An example of what the theatre looked like
Eugene O'Neil was America's first great playwright. His full name was Eugene Gladstone O'Neil. He was born on 16th of October in the year 1888 and died on 27th of November in the year 1953. <span>Eugene O'Neil was also a Noble Laureate in Literature. His plays were the first that included speeches.</span>