I grew up in cincinnati ohio
Anyone familiar with it can tell you it can range from -15f in a very cold winter
to Mississippi like summers.
Must be the river valley or something.
In summer, like many have said, 1st part of the day you closed the house, and drew the heavy shades.
House was brick, you spray it with the hose to soak the walls later in the day
to suck some of the absorbed heat back out.
Swamp coolers dont work there, humidity is too high on average.
Most had window awnings that you rolled down in the day to stop direct window sun
which helped.
Fans, back then they sold real fans.
Metal ones with strong motors that you could screw into the window frame.
You put one of those in one window, usually in the attic if possible, and open the basement windows.
Pulled enough air to start sucking all the doors closed, so you had to prop them open with a door stopper.
Plus you had nice little table and floor fans, they worked much better than what they sell now, even if they did sound like small airplanes when on high speed
Houses were of different designs too.
Taller ceilings, different floor plan where all rooms but bedrooms passed into each other, so air circulation was better.
Different materials less bothered by heat and humidity, no drywall.
And probably mostly, you were simply just used to it.
As kids we ran around outside regardless of heat until we were bloody beet red in the face and some adult made you come sit in the shade and drink some ice water.
Night time, fans and windows, and you went to bed early enough to take advantage of it so that you were getting up before the sun cranked up the heat pump again.
I live in florida now, the house is designed like crap as far as that stuff goes, everything designed around the fact it should have central heat and air.
Still, i try to not turn it on until the humidity kicks up for the year (Cause a modern house just wont well survive the humidity) When i do turn it on, it’s only to about 85 degrees during the day to pump the humidity back outside, soon as the humidity blows itself out after august usually, back off goes the AC and back open go the windows.