Are you going to try and ad Co2 and run sealed or are you going to be venting out?
If you are venting a single hose portable works well, it will provide you with your air exchange. Keep in mind all that hot air blowing out that hose is some of your air conditioned air. Dual hose is supposed to draw in one and exhaust our the other, but they either leak or are designed to draw some of your conditioned air out as well.
Both of these types will make running a sealed room with co2 very tricky. If that is your goal, then a minisplit or window ac is better.