Mr Russell wrote:
I don't think one of the ones where you have to stick the hose out the window would be any good because our windows only open a crack at the very top
Air conditioners are like fridges, they don't make cold; they move warm around. As such they have to vent somewhere.
Could you make it work with something like these fabric window vents?
https://www.amazon.co.uk/s?k=aircon+win ... _sb_noss_2Failing that, you can get air coolers, like this one:
https://www.amazon.co.uk/Igenix-IG9703- ... 033&sr=8-3(link for illustrative purposes only, I have no idea if this one is good)
They have a water tank and/or ice blocks you fill up and airflow over a radiator. The water evaporates and cools down, and so cools the air as it blows over it. It's not as potent as an aircon but doesn't need an exhaust.