Very US centric take. I'd be curious to see how Dubai or Singapore stack up in terms of energy consumption per capita compared to large cold-climate cities. Everything is air conditioned and there is so much enclosed space because being outside sucks so bad.
There are extremes at both ends. I live in a place where you have to pay for heat 6 months out of the year to survive. Most of the warm climates I've lived in have 1-2 unbearable months max. Why do you think you see so many homeless in warm climates?