Both of you are correct in your skepticism, that is why I also noted that under the listed room amenities is the statement about air conditioned rooms.
If they don't have any, or even a limited supply, then I certainly think that Hilton owes you a refund if you are placed in a non-a/c room as the website clearly states that the rooms do have a/c.
Of course, that is quite different that inadequately air conditioned rooms that I have found to be mostly the case throughout Europe, as compared to what we Americans have come to expect.
One exception -- I do seem to recall that my stay in the fairly new West Tower of the Metropole was great and the room had a very good A/C unit functioning. In addition, when I used their small health club to do a jog on the treadmill, I found that it was absolutely fantastic, as they had a constant stream of very cold air coming into the club to cool one off while they were exercising.
PS -- Among its other failings noted on this board, I certainly would not be surprised if the Hilton Hyde Park also lacks A/C, as it is an older hotel.
[This message has been edited by NJUPINTHEAIR (edited 08-10-2003).]