I don't know much about the 60's-70's in the South
@Alligatorob , as I was a Yankee living up north back in those days

Did move to Phoenix in the 70's.
Local news (Houston) is saying that we are breaking heat index records everyday now, records that go back to the 1920's.
That plus the length of the misery .... recovery time is harder in the current situation.
Then there are stories like this about Phoenix - from the Washington Post yesterday:
Temperatures are forecast to soar to among the worst in history and set records for electricity demand. Experts worry that this combination could create a nightmare scenario: a brutal heat wave and multiday blackout that, according to one study, could kill thousands of people and send half the city to the emergency room.
https://www.washingtonpost.com/climate-environment/2023/07/13/phoenix-heat-wave-blackout/
@MarkinPhx .... you doing okay?