They could literally stand on top of an A/C vent now and keep cool all through their performances
As a general rule, air conditioners and music do not go hand in hand. They always make too much noise, and disrupt the flow of the music. This is why a lot of major rock bands used to keep huge oversized fans just offstage. They would keep a continuous blast of air moving across the stage, which helped to keep the musicians cool under the hot stage lights. It was not very efficient, even if it was pretty quiet, but I had a better idea. As a certified HVAC tech I was overqualified to be a roadie, but I had always been in love with live music. I went to the band I was working for at the time, and told them I could rig up air ducts into the stage itself, so they could pipe in AC from behind the stage. It would be far enough away that the sounds of the air conditioners wouldn’t disrupt the music, and would give them air vents they could stand on top of and the audience would never notice. It took a little trial and error to get the air vents and ductwork placed just right, but we finally made it work, and the band was stoked. They could literally stand on top of an A/C vent now and keep cool all through their performances. This was a while ago, by the way, before a time when HVAC tech was smooth and quiet and able to be placed virtually anywhere. At the time, we were all way ahead of the curve!