Portable Roll Around Unit
We bought a portable roll around unit at Sam's club that exhausts hot air out of a six inch flex tube - about a perfect match for the bathroom roof vent. It is about 25 inches high and 14 inches square. We use it to cool a computer room/phone room. It weighs 25-30 lbs. If I didn't have a rooftop unit - and lived in a more temperate climate, this might be a great solution. If you put it in a shower and had a lot of condensate, it could just go down the shower drain. We paid less than the ones listed below. Do a google search for portable air conditioner
Today is a gift, that's why they call it the present.