Where i live in central Europe most houses dont have ACs and 20 years ago during the hottest times of summer you’d reach that indoors with keeping blinds shut and airing out at night. Nowadays 30°C+ indoors as hottest summer temperatures is pretty common. At 26°C you can still function somewhat. Especially when you are used to these temperatures it is still fine for office work.
Where i live in central Europe most houses dont have ACs and 20 years ago during the hottest times of summer you’d reach that indoors with keeping blinds shut and airing out at night. Nowadays 30°C+ indoors as hottest summer temperatures is pretty common. At 26°C you can still function somewhat. Especially when you are used to these temperatures it is still fine for office work.