Ouch, tough luck. Just goes to show that the weather gods do indeed have a sense of humour though.

I can't remember where I read this, but apparently you can make a makeshift air conditioner by nearly filling a 2 litre coke bottle with water, freezing it (carefully taking care that it doesn't split in your freezer), then setting it in a bowl in front of a fan. And it will produce a marked cooling effect.

I haven't tested it myself, but it sounds an intriguing idea.