Try to stay cool about this fact.
I mean, is sounds like a joke, but I am serious.
I persistently ignored my emotional outbursts triggered by environment heat long enough, till I stopped reacting emotionally to this unpleasant factor at all
(I don't know about others, but I CAN train/tame my emotional response module/layer/part this way by NOT focusing on some emotions, they just stop appearing after some time. Sometimes it takes weeks, sometimes years until I manage to delete some annoying reaction completely.)
And now i I'm not noticing anymore how hot it is, unless I want to focus on that sensation.
Or I have to remove some sweat from my forehead, what reminds me that I should drink much.