My childhood home(up until about age 12) didn't have central air and we had 2 big A/C units. A GE made JC Penney model in the living room downstairs and a Sears Coldspot in my parents room upstairs. We used a box fan in the hallway outside their room to get air to the other rooms. Most of the other homes in the neighborhood still had window/wall units and I could usually tell from the outdoor cabinet if they were GE or Sears/Whirlpool units. Those were by far the most common. Both of ours were 220 models so I can only imagine what they would cost to run today!
Speaking of A/Cs, does anyone have any pics of older PTAC units? For some reason, these always fascinated me. Maybe it was because they heated and cooled, were close to the floor and easier for me to investigate, but it was always a treat for me as a kid when we would go on vacation and stay in a hotel. I still remember 2 distinct models that were common back then, one was the GE Zoneline with the pushbuttons and the outdoor blower visible on one side of the exterior cabinet. The other was a Friedrich Climate master which it seemed all newer hotels being built in the 80s had. Today it seems all of the PTACs(GE, Carrier, Amana, LG) all look the same.