A recent visitor to my site asked if there was such a thing as a portable ac unit devoid of vent. I published back that I'd not heard of before one, but would check it out just in case some new advance in portable air conditioner had slipped by me.
What I discovered was the Haier Commercial Cool 14,000 BTU Portable Ac. In the product description it states there's no need to install a vent, however continues a "window exhaust kit" is included with the investment.

In my opinion what they're attempting to accomplish is persuade you and me that the word "vent" should be put on to everlasting installations simply love those for clothes dryers, and temporary installations, such as those used for portable air conditioners, aren't really vents at all - they are "window exhaust kits."
Call it what you will, a proven way or any other the hot air generated by the compressor must be exhausted from the room. So I guess if you order a Haier you'll be "window kitting" the hot air out the window instead of having to vent it such as everybody better.
The simple fact of the matter is there's absolutely no such thing as a portable air conditioner devoid of vent.
Therefore if you are looking for a portable cooling unit that doesn't involve venting, (and once more the word "portable" is at the mercy of interpretation) you have 3 choices: A fan, a little window air conditioner, or perhaps a portable ac window kit swamp cooler - also called a portable evaporative cooler.