AC made a huge difference is what was desirable weather.<p>NYC population in 1950: 7,891,957, vs 8,175,133 in 2010.<p>Houston, Tex. population in 1950: 596,163 vs 2,016,582 in 2010.<p>PS: Without AC, even NYC get&#x27;s unpleasantly hot in the summer so there are clear tradeoffs on the east coast.