I am studying at the moment and the classrooms we are in are not airconditioned and i can tell you now that i abxolutely see it as a neccessity - NONE of us - including the teachers can concentrate when it is hot! Whilst i am in melb and it is only revoltingly hot a little of the year it is just not good for the brain to try to learn whilst it is so busy trying to cool the body down!
We are in North Qld and growing up we didn't have it at school and I don't have any bad memories..
Although it gets quite humid here, we rarely get in to the high 30's or to 40.
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