Why is everyone kicking up such a stink about classrooms not being air-conditioned? Kids should just learn to harden the fuck up. If your kid is too fragile to go without air-conditioning maybe you should pack them off to some posh private school where they will kept at a constant temperature of 23 degrees. Studying in a baking hot demountable teaches you a valuable life skill - that of not being a soft little pansy.
If we wanted to cool down we had a bubbler. It was fine.