I've noticed that a lot of reasonably priced hotels in London (might apply to all of Europe) don't have air-conditioned rooms; they have AC in public areas but not in the rooms; they do indicate that windows can be opened. But I know that on really hot, humid days in NYC, opening a window is not going to cool you off. I'd really go for the hotels without A/C (like Ibis Earls Court) but am afraid that in July it might get hot and humid and I won't be able to sleep well. Has anyone stayed in a hotel in the summer time in London with A/C. (funny thing is I don't have A/C at home but I have a ceiling fan which is very good).