Pulling air from inside tent OG

Hey guys, I expanded into another tent. I have an open wing in one tent with an A.C. unit, but expanded and had a buddy gift me an OG air cooled hood(for free can't beat that). My question is in the new room I can't really afford another A.C. unit at the moment, and I'm pulling air from the bulb but it's from the inside of the tent...not the outside, would it be cooler to pull from the outside? The duct run would be another 3ft...with a 6in inline, 440cfm. If anyone could shed some light on this question is be very grateful. If you're gonna say just try it...id have to cut a hole into the room just to try.. so trying to avoid that by asking first.

You might be ok if the 2nd tent is dedicated as a veg tent with batwing, and you put OG hood in first tent with AC. Otherwise I would try and hook ducting up in parallel to the AC, instead of in series.