Me working from home in the UK today in a house designed for winter with no air conditioning (as is all typical in this country, since the industrial revolution had barely happened when most were built, let alone global warming):

25 degrees sounds blissfully Baltic compared to the day I had today

There are not enough fans in my house

The roof above my head is probably close to 40DegC, but I put 150mm insulation in, so it's not toooo bad at the mo

That's where the external heat's coming from.

The internal heat is me, a laptop under heavy load (corp security = noticable% CPU), some monitors and the NAS (which is now on automated power on / off cycles to reduce heat)

But yeah, we have no AC. We only have a few weeks in the year like this - at scattered random times - so it's not worth installing. Next week we might be back down to 15DegC

And if I put a unit in my window then I'll basically be living in a dungeon.