I grew up in coastal Florida in a concrete block house (cypress beamed high shed slant roof design) my father had built in the mid 50's when the whole family moved from New England. All through my years growing up we had no air conditioning and the house was mostly comfortable. With nothing but empty space between us and the beach (about 800 feet) there was a sea breeze that moved right through the house by 9 am and we had ceiling fans in almost every room (high ceilings). Sheets hung out on the outside clothes line on laundry day flapped away in the moving air like horizontal flags. In winter time we had a centrally located kerosene (#2 oil) furnace that pumped hot air into the house. During the energy crisis times of the 70's there were local newspaper articles about how my mother got her energy use down to under 24 KWH/day. Later when homes were built between us and the ocean (blocking the air flow) my father had a central air system installed and gone were the days of low energy use (although they were always ones to have the thermostat set for maximum savings). In that part of the country the best comfort effect of AC was to pull the high moisture out of the air.
I seem to remember the cost per KWH was in the 10-11 cent range (depending on amount used). Electricity down there was supplied by large oil burning power plants. The costs were lower when I lived in southern Maine by a a couple of cents and always shot up in cost for a period whenever they took the Maine Yankee nuclear plant offline for maintenance.
It is interesting to me to live in another climate (here) where houses have been built (this one in the 80's) with no central air handling systems. We have gone from electric baseboard to changing out a corner fireplace for a pellet stove, to ultimately replacing that with a freestanding gas stove and using some small heaters upstairs. Each change of type of energy or appliance use has its tradeoffs in savings, comfort, cleanliness, and bother. As energy efficiency in homes, appliances and lighting improves - energy use can go down. The move over the last few decades to huge interior space homes has worked counter to that maxim, but somewhere along the line, hopefully, we will learn to strike a balance.