We had window air conditioners unti we got central air in '73.
The first one was a Mitchell, and my dad bought it used when I was about 5, so that would have been in '60 or '61. It was in my parent's bedroom, and it sure put out the cold air. One thing I remember was that we had to be careful not to turn on many lights or plug in something like the vacuum cleaner while it was on, or a fuse would blow.
The next AC purchased was for my sister's bedroom, and it was an Admiral (new), sometime around '67. My BR was in the basement at that time, so I didn't need one. When I moved my BR back upstairs in '71, we got a Westinghouse for it. Had to put in new wiring for it as it was on the same circuit as my sister's BR, and promptly blew the fuse when it was tuned on the first time.
The Fedders pictured is like the one that was in a barber shop I went to as a kid.
Only remember one neighbor having central air when I was a little kid, and they were somewhat well to do.
Several of my relatives in the south had central air early, as most lived in newly constructed homes.