Not everyone adapts equally well. My sister has always done well in humid heat. I grew up in the same humid heat and never could function well in it. There are some individual, physiological tolerance ranges--we're not all built exactly the same.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks