Ok you can go adapt to the cold by killing large animals to eat and also so you can use their skin as insulation. That’s why there are so many more Eskimos than there are Polynesians. You will also want to learn how
To melt frozen water. I meanwhile will adapt to warmer weather by eating coconuts and pineapples and sitting in the shade.
It’s also why there are virtually no reptiles in the Arctics but there are mammals and birds. And some of your tropics feature rather spring-like weather than summer. Go to the desert if you want true equatorial hell.
You cannot handle much more than 110 deg, which is only a few degrees above you body. You can’t strip beyond nude to help cool down, and only hope to use ice packs at that point but they won’t last.
But you can put on more layers to easily survive freezing, which is some 70 deg below your body temp.
Point being, we already survive low temps. But if it did actually keep creeping up in temp just 20 deg, you’d fry.