A/C for us growing up from 78-82 when I played 15U baseball ... find the biggest TREE that had SHADE.
We were always outside playing ball, my buddies mom would yell at us because we made holes in the yard for bases. So we had to move our field from time to time. Our HR marker was the black electric line running from telephone phone to telephone pole and there would always be a discussion if some balls were truly HR's or not, but we'd resolve it and continue playing SANDLOT ball at its best.
There you go! That's how we rolled and dealt with the heat back then.
BUT unfortunately, we have the new waive of coaches that believe they have reinvented the game and wanna get paid and make $$$$$$$$.
Com'on you new crusaders, it's only one way to play the game and that's the right way!