You do forget that Europe, in general, doesn't know AC is a thing. Plus, humidity. I'd take hot LA over lukewarm London any day.
But then again The Khmer empire was a big deal... and it's oppressively hot and humid there. I don't think I've ever been that hot in my entire life. I'd wake up in the middle of the night to stand under the shower and then lie spread eagle under the fan so I can cool down for 5 minutes. I drank 3L of water in 3 hours, without even needing to go to the bathroom when visiting Angkor Temples. When it's 45 degrees in the shadow and you see construction workers digging a ditch, you realize you're just a pussy westerner and you have no right to complain about the heat ever again. How they build a massive empire there is beyond my understanding. And it's not like they were building the pyramids in a temperate climate either.
I’m in Toulouse right now, and it’s a different fucking planet