Aircon in Schools

What temperature do public schools typically stay at? I'm aware of the CoolBiz campaign and having been in Japan but never inside of a school, I was curious of how cool/hot it might get. I know aircon is used sparingly, but do the students ever complain of temperatures? I see a lot of conflicting answers online.

We are arriving in March through Borderlink and want to be dressed appropriately.

Thanks in advance for your time

by Open-Ticket-6095