2k watt sealed room- problems w/ loss of co2

[africanherbman1]

Right now I'm running 2- 4x4 trays ebb and flo. I have an aircooled hood above each tray that are being cooled w/ a 440cfm cam fan pulling cooler air from another room. I also am using a 9k btu ac to keep the temps at a comfortable 80-85. Im using a harvestmaster to keep the co2 at 1500 ppm, and am having an extremely hard time doing that. This isn't my first sealed room I've set up, but it is the first time using the ac unit. The ac unit has 4" duct that comes from the backside and runs straight into the attick. My guess is that it's just sucking the air from the room straight up. I was under the misconception that it was a closed ac unit, where as the air is just being recirculated. So I guess what im asking is could somebody point me in the right direction for a closed ac unit, and if at all possible one that I could still run the hot air into the attick? Thanks!

 

[Delta Force]

if you have a stand up ac with a single hose you are most certainly exhausting the CO2........either a window unit with a closed exchange vent or a dual hose standup is needed.....the single hose standups blow 1st of all.....with a sealed room...double that. If you have another room adjacent id just run a window unit and close the vent off.....my...02 cent.

 

[africanherbman1]

How many btu's are the dual standups? I was thinking about building a 3x3 frame up to the ceiling where the hole is. I would get a closed window unit, have the back end on the inside of the frame w/ just the face flush. I would use panda film to seal the mini room up and probably have a 4" cam fan pulling the hot air up to the ceiling. It's either that or using the dual standup which sounds a lil easier to set up. Pros and Cons?

 

[Delta Force]

10 or 12k usually.....did you ever build the ac box or get a dual hose?

 

[G33k Speak]

Get a good 10K window unit, and stop venting. Seal the room. You can upgrade to sealed hoods if you have the cash, and just suck out the heat from the lights without losing the AC'd air and the CO2.