I really suffered from high temperatures when I was young, and it wasn't until I tried a sauna in my forties that it ceased to be a problem; it appears I had to learn how to sweat properly. I don't know if it is anything to do with being autistic, but it could be why I was so often accused of shirking in the work place. Where some can break into a sweat just by thinking of work, I always appeared cool and dry, leading people to think I was taking it easy, when in all probability I was suffering from overheating, and thus having a worse time of it than the others! Nowadays I've learnt not to use fans or climate control of any kind, but rather to tough it out (within reason, of course) to get the sweat mechanism working, and I find I soon get used to the ambient temperature. Full on AC prevents this acclimatisation, and is just a stupid waste of money and energy, really.