Sealed grow room help

I have a totally sealed 8x18x8 room fully insulated.4ea x 1000hps. I don't exhaust. Sealed Cool tube lights are ducted thu and outside. Thru wall A/C unit is 12,000 btu. I run 1500 ppm Co2. I scrub air with can carbon filter 75 with 8" HO inline fan.
PROBLEM: just started flowering and Humidity is reaching 99% during dark periods. Will a 45 pint dehumidifier work, if I time it for dark period?

Is it required to shut down Co2 during dark period?

From my point of view,you can try for it.Try and try will get different idea.Then you can get the best answer.

Really? I don't even understand what you wrote? But thanks for trying.

no co2 during dark period.

FirstimerOG said:

Really? I don't even understand what you wrote? But thanks for trying.

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lol...........Rep just for making me laugh bro........

Ok so you dont run Co2 at night ever and in a sealed room (closed loop) you must have a Dehumidifier and for a room that big Id think you'd want a pretty big one no doubt.......

Also, Are you using a full 18 x 8 space for your grow canopy? Because if you are and you only have 4 1000watters that is way under doing it man. i dont see 4 lights covering 8 by 18...........Id do 4 1000ws in a 8x8 which would be 1000ws per 4x4..........Or id do 4x16 and run the lights in one long row which is still 1000watts per 4x4 area......Thats why i ask if your using all that space or just growoing within that space.....

Cool. I'll go put the fuzzy3 on a timer. I'm only running 4 ea 4x4 trays I have a little walkway and room for fans,tanks, and a nutrient cabinet. It's actually getting kinda tight in there. Cant expand do to state laws on sizes and quantities.
Finding a dehumid that will start when a plug timer trips it on is difficult.
Thanks for helping.

Just set the dehumidifyer and let her rip I dont think it will scrub the co2 out as long as it isnt vented out side
"Set it and for get it" LOL

You have your AC ducted outside but you have a sealed room?

You definitely need a dehumidifier but I am confused about your room. If you are ducting out air, you are sucking in air and you are wasting co-2.

How does the 1 ton keep up with heat from 4kw of light? If the AC is working really hard to keep up, it is dehumidifying the air like mad in the daytime and when it stops venting at night the moisture builds up fast. One quick solution would be to leave your AC fan set to 'always on' if it's an option. Then you are exchanging air at night too and keeping the room somewhat normalized. But realize that you are not sealed, air is getting in. This is fine, it's not the end of the world but you want to make an inlet vent and put a hepa filter on it so you control what is getting in to the room and you aren't just pulling in from all cracks.

a mongo frog said:

no co2 during dark period.

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Yes, this^^^

Okay. I stand corrected. It's not totally sealed. Being there is an AC that vents out. The rest is sealed. Not one crack. It has a triple layer of 10 mil shrink-wrap and all staples are covered with 15 mil poly tape. Door has a double airlock with weathertight steel door. I would like to upgrade soon to a split mini to reduce emissions. All current emissions from AC go into an interstitial space and are carbon filtered again. I am designing a small dump to ensure neg pressure as a backup but it will start sucking up the floor and pulling on the walls if a little too strong.
My issue is setting the enviro controls to keep a balance. I have a lot of timers working to achieve this. Heat from cool tubes is of little concern with a straight thru venting with 6"HO can fan. The AC runs nominally this is why I took the advice given here and put in a dehumid on a piped drain.
With all this advice, my Tru-OG is looking real good today.
I put O2 regulator on a timer and dehumid too. No wet floors at dark time now.
My medicine is looking promising. Thank you all. Your advice and comments are priceless.