As a general rule, a/cs and tunes do not go hand in hand! They always make too much noise, and disrupt the flow of the tunes.
This is why a lot of major rock bands used to keep crucial oversized fans just offstage.
They would keep a continuous blast of air moving across the stage, which helped to keep the tunesians cool under the hot phase lights, but it was not truly efficient, even if it was pretty quiet, however I had a better idea, however as a certified Heating, Ventilation & A/C tech I was overqualified to be a roadie, however I had always been in appreciate with live tunes. I went to the band I was laboring for at the time, and told them I could rig up HVAC ducts into the phase itself, so they could pipe in AC from behind the stage. It would be far enough away that the sounds of the a/cs wouldn’t disrupt the tunes, and would provide 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 HVAC duct sited just right, but every one of us 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 Heating, Ventilation & A/C tech was smooth and quiet and able to be sited virtually anywhere. At the time, every one of us were all way ahead of the curve!