Well, definitely not North America because there it seems to be a mandate that you gotta freeze inside during summer. But trust me, you (still?) can live without AC.

Maybe when it's really dry inside ? But indeed, over 25/26 with central european humidity is unpleasant.

Bucharest here. I'm fine at 25 but if you ask my wife she'll say that it's too cold. I do realize though that different people have different definition of comfort ¯\_(ツ)_/¯