I am old enough to remember when no one had air conditioning. We slept with the window open and hoped for a breeze. If not, we put a fan in the window. That is people who lived in an area with electricity did.
Schools and chrches were really sweat boxes.
But we survived!!
Now everyone has air conditioning.
Obviously the group that concocted this “study” is too dumb to turn the thermostat down.
Schools without A/C were brutal on hot and humid days.
In this area they were often made of brick which effectively turned them into wood stoves!
I never had AC in my home until I was in my forties.
It’s nice when it gets super hot and humid here, but I generally don’t like it and have never been sure it’s really healthy.
I prefer fans. If my husband weren’t so sensitive to heat, I’d probably only use the AC now and then.
(Another thing that doesn’t seem healthy about a lot of modern apartment buildings is the lack of cross-ventilation. I guess they figure you don’t need it with the temperature controlled artificially.)