Greenhouse Plastic Sheeting to seal lower half of room?

’Sup RIU! I’m delving into the world of CO2 supplementation and sealed rooms for the first time. The perennial conundrum is: how to keep room cool efficiently/cheaply while conserving as much precious gas as possible. Right now my set up involves a portable a/c vented to an external air cooled hood (acts as a lung) into which I placed a carbon filter and in-line fan. Pretty janky but it works.

Thing is, right now I’m running two aircooled HPS hoods (1000w each run at 75%) and a 620w HLG quantum board at about 75% power in the middle. I’m trying to switch over to all quantum boards, but worry that a sealed room with 1200w of LED will get extremely hot and require constant a/c to cool, defeating the whole point of the more-efficient LEDs!

SO, I was brainstorming solutions and thought, what if I affixed greenhouse plastic sheeting to the walls of my tent and stretched it across, right below the level of the quantum boards, to essentially create two distinct zones, plant zone and light zone. I would tape the shit out of the poly film so no air could exchange and completely seal the lower half of the tent, where I would send my CO2. Then, I’d just use an exhaust fan on the top port of the tent to extract the hot air rising from the lights. Has anyone tried something like this? Any idea what percentage of lumens/PPF I may lose from putting thin clear plastic between the lights and my plants? Any input would be most appreciated!

I picture a mini rainforest.

I would also maybe think about heat from the lights possibly 'melting' the plastic sheeting in the area directly below your lights. But the idea sounds plausible otherwise, the trick might be getting the two pressures just right to avoid too much 'ballooning' in either direction.

how big is your room? The bigger the room the tougher it would be to get an airtght seal between zones.were you justy gonna tape it or seal it another way?