It would seem to me that if you were using a small dedicated room it is smarter to put a portable AC unit in a semi-sealed room then to bother with venting. The AC recycles, cools and (most) cleans the air. All have a temp gauge. Most will also pull out humidity, if needed. Sounds good on paper...as least I think. Anyone? Ive searched the threads but couldn't find anyone that is actually using it.