The UK is not equipped for anything except very mild weather, but we are fast moving away from that! I hope that in the future things like AC become the norm rather than the exception.
Personally don't mind punting in the heat, just change the punt to focus much more on oral, which makes for me anyway, since I generally do prefer it that way! If the SP has AC, then carry on as normal.
Some SPs even use the portable ACs which are rather loud and inefficient, but it still does the job.