APCO has recommendations. If its 100 outside they recommend 80 inside. I'm certain that is systematically and scientifically derived.
How much you want to bet the person who wrote that is sitting inside at 68 degrees and looking at stupid sh1t on the internet right now?
https://www.wsfa.com/2024/06/25/ala...80-degrees-when-its-100-degrees-outside/
