I used to hate the hot weather and stuffy environments, till I became involved with freelance mascot/charity work. Inside a costume, temperatures rise above 40ºc, most don't have cooling but mine has fans inside the head to help draw out hot air caused by breathing and draw in fresh air through the mouth/eyes. Keeping the head cool really helps, even if the body is hot.
I often forget i'm wearing a fleece jacket till someone comments how I am not melting in weather like this. It's possible to get used to heat, took me years to build up the tolerance.