Is it true that you should only set your home air conditioner 10 degrees below the outside temperature?
Doing so will save you some money on electricity. If your insulation is sufficient, a lower setting won’t cost that much more. It’s all a matter of cooling capacity, temperature differences, and R-factors. At some point, the temperature difference and the R-factor are going to catch up to the capacity of your unit. It will run constantly, but will not cool the house any further. That would be expensive. Pick a temperature you can tolerate and afford.