its hot hot hot in my flat and ds can't sleep so i can't sleep and am going mad. Fan just blows hot air around, was told by a friend to by an air cooler - a fan unit you can add cold water or ice to but there seem to be so many in varying prices that i was wondering if anyone could reccommend one, is more expensive better or do they all do the job just without the fancy extras?! HELP...am melting!...