Well, the AC gets vented to the outside of the room of course, otherwise you're just putting hot air and moisture back in the air, where there would probably be a net decrease in temp, but it would be so inefficient.
also the demumidifier/carbon filter get vented to the outside (actually I guess it doesnt matter if the carbon filter vets vented outside).
with three different things being exhausted out of the room, I dont know how it can technically be a 'sealed' chamber, unless you have some way to prevent air getting sucked back in through these exhaust exits while they arent on.
I'm assuming 'sealed' has to mean having absolute control of the air entering and leaving the chamber, which means some work/valves/construction/planning to prevent backflow. I dont even know the necessary material to do that with.
so basically we're looking for the most control of airflow, and the longest time in between venting times.
but what happens to the gas ratio and net pressure inside the chamber if the three things exhausting out of the room are intermittantly removing air from the space? we're replacing the CO2 until its at the proper PPM, but if there is actually less air particles in the air, that will make the PPM of CO2 kind of meaningless...no? this whole things is getting a bit complicated, I got some research to do.
You will need to use a mini split system($699up) instead of a package system(portable ac). Difference is, in a split system the condenser sits outside and is connected to the evaporator via a refrigerant line. That way outside air is used to dissipate the heat from the condenser and the evaporator inside will only recycle air
