portable ac negative pressure

i bought a dual hose portable ac for my sealed room and i am having a negative air problem. my co2 burner is on way more often because the ac is sucking it out, and that is making it hotter which is keeping the ac on longer. has anyone else experienced this with a portable? and is their a unit out there that doesn't have this problem? any help would be much appreciated

Don't know if theres a portable A/C out there that won't have the same problem, but you could try raising the A/C up off the floor. Hanging it from the ceiling would be ideal.

that might be tough for me, my room is 6x9 and im venting my lights right above where the ac needs to go.

Do you have the input hose pulling air from outside the room? If not, that will take care of most of the problem although many two hose systems draw in some room air via the grills.

yeah, i have the in comming in from the garage my room is in and the out going into the roof.

i think i solved the problem. i put a inline fan with a speed controller on the intake so any air the a/c wants to suck out of the room, i pump it right into the machine. its cooling more efficient and im wasting alot less co2. i want to put the inline on a thermostat so it turns off when the a/c turns off, that would be optimal.