As a general rule, a/cs plus rock n roll do not go hand in hand, and they always make too much noise, plus disrupt the flow of the rock n roll. This is why a lot of major rock bands used to keep substantial oversized fans just offstage. They would keep a continuous blast of air moving across the stage, which helped to keep the rock n rollians cool under the tepid phase lights, then it was not honestly efficient, even if it was pretty quiet, despite the fact that I had a better idea, however as a certified HVAC tech I was overqualified to be a roadie, despite the fact that I had always been in appreciate with live rock n roll. I went to the band I was toiling for at the time, plus told them I could rig up HVAC ducts into the phase itself, so they could pipe in A/C from behind the stage. It would be far enough away that the sounds of the a/cs wouldn’t disrupt the rock n roll, plus would supply them air vents they could sit on top of plus the audience would never notice. It took a little trial plus error to get the air vents plus HVAC duct locationd just right, however we finally made it work, plus the band was stoked. They could literally sit on top of an A/C vent now plus keep cool all through their performances. This was a while ago, by the way, before a time when HVAC tech was smooth plus quiet plus able to be locationd virtually somewhere. At the time, we were all way ahead of the curve!