How common is air conditioning in private school classrooms?

[ParentOfOne]

How common is it to have air conditioning in private schools?

I don't mean just the principal office or the staff room, I mean the classrooms where pupils are.

We are a state school family, but I have heard lots of colleagues complaining that their expensive private schools don't have aircon, so I was wondering how common that is.

Also, how common is it to have private schools built llike greenshouses? In the state sector, quite a lot, because I think that for a while guidelines prioritised heat retention and sun exposure, without taking into account that the weather is not that of 200 years ago any more.

Really surprised by this thread. DC is at state primary. They have aircon in all buildings, including the original Victorian school.

BBC story on a school built with the PassivHaus standard https://www.bbc.co.uk/news/articles/c3ry7v7xnvyo

Most buildings (flats schools hospitals) built over the last 20-30 years are greenhouses.
We must build the new stuff very differently.
But what do we do with the old stock? We cannot demolish and rebuild everything. And there is only so much which can be adjusted ex post.