Depends on what part of the world you're living in. Where I live (North central Idaho, at an elevation of 2,500 feet), new houses were being built without air

Depends on what part of the world you're living in. Where I live (North central Idaho, at an elevation of 2,500 feet), new houses were being built without air conditioning 10 years ago, because it typically didn't get hot enough in the summer to justify it. Our summers are getting hotter, so that's changing, but here that change has occurred in the past 10 years. Many people still live without A/C on much of West Coast (Oregon, Washington and BC), so long as they live in a temperate climate near the water there's rarely a need. So, living in a house where the temperature is A/C controlled at 75°F in the summertime, isn't going to be too different than living in a climate where summertime temps don't often get above 75°F.