Even in Minneapolis it's hard to imagine a new home without A/C but when I was kid it was considered a luxury. Neither of my first two cars had A/C but I'm guessing that few cars are sold without it today.

So yeah, if you spend 90% of your time in a climate controlled environment barely exerting yourself, just being outside in 100 degree weather is very uncomfortable let alone running or riding a bike. Yet people have lived in desert climates for how long without the benefit of A/C?

If you've ever read "Endurance", the book about Shakleton's antarctic expedition you might remember that the expedition members grew to prefer temps around 0 over warmer weather. Why? Because the dog sleds moved better and you didn't get wet from snow melt. They got used to it and managed without all the fancy gear and high tech materials we have today.