Need help with AC in airtight room

I am moving to a bigger room airtight and co2 only I go in my 8x5x6 room now hhas a window unit that doesn't seem to suck out the co2 butits not going to be big enough for new room 15x9x9 I have a portable ac a samsung or lg I believe will it work it is a really nice unit but when I pipe it out the building don't those types of ac suck air out the room when they vent the hot air out I get the unit here tommorrow and will be able to get a better idea but if anyone has used one let me know maybe its a stupid question and I could wait till tommorrow and answer it myself but like my 3rd grade teacher says "thw only stupid question is the one not asked" hahaha any help appriciated
 
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