Easier to adapt?
I’d disagree. Reptiles, maybe. But we mammals were made to endure the “cold”, and cannot deal with temperatures much higher than our own.
Ok you can go adapt to the cold by killing large animals to eat and also so you can use their skin as insulation. Thats 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.
Easier to adapt - I was referring to humans.