Help cooling unventilated closet.

I'm running a closet grow. My closet has absolutely no possible ventilation. It's about 10x8 in size. My veg chamber consists of two 4' cfls. My flower chamber is going to have a 400w hps light on. The room has an oscillating van over veg, a large high power fan built into a customer odor scrubber, and a smaller van built into the same scrubber (so I can dramatically alter airflow and convert my flower chamber to a curing room after harvest.)

It is getting way too hot during flower hours. I am tossing around a few possible solutions, but could really use some suggestions. Please let me know if you have any helpful ideas!

Thanks.

You have a good size closet for what you are doing. Opening the door at least once a day should suffice, based on most of my experiences. But every place is different...

How hot are we getting here?

Have you considered a cool cube for the hps.

Try to get everything as low as possible.
With "absolutely no possible ventilation" the only thing I can imagine would be something like a block of ice or something like that.
You'd have to actually put the cold in there manually. pita?
Is the other side of the closet a room? Make sure that room stays cool. Is the attic very hot? Install some vents to get air flowing from outside into and through the attic. If one of the other sides of the closet is an outside wall is the sun hitting it directly? If it is maybe you could cover it somehow. You might also adjust the timing of the lights to be off when the sun is hitting it or just during the hottest time of day. Depends on a lot of things.

you know I grow in a closet that at one point had no possible ventilation... then I cut some holes in the wall.. because I'm super serial..

Thats a big closet...you can put a portable A/C in there.

You have 4' CFLs?...those must be huge! lol.

I think you mean Fluro's or T5's...

If you have no ventilation your plants will not grow or yield as well as they should.

Good airflow is not just for temperature control, your plants need to breathe

What you need is an enclosure within the closet, so you can leave the closet doors open for ventilation and not worry about always being there to close it when you're flowering.

for a 10 x 8 room you need an inline fan and cooltubes. seriously bro. you need to be able to clear the room 5 times per minute, im talkin bout the cfm. you need a 10-12 inch inline fan, i would go for the 12 inch. if it gets too hot, your plants are gonna fry, and you'll lose out on your yields. good luck

Thanks for the feedback.

The room outside the door is my bedroom, it stays pretty cool (warmer than most of the house since I have the grow room.) I have neighbors above and on the other side of that wall. Thanks to no ventilation, smell isn't really an issue, and I have a badass odor scrubber. An enclosure to leave the door open is an interesting idea. Like build something movable that fits the inner frame of the door?

@ letic, nope, I mean 4' cfl lol. They're just shop lights from lowes with a warm and cool cfl tube in each of them. One sits a little higher over my moms and white rhino (which grows taller) and the other sits over my bubbalicious and clones. I may upgrade my veg lights in the future, but the cfl is definitely getting the job done.

@adosmoke: I have a cool tube on the hps. It vents it out of the flower tent and into the rest of the closet, I'm worried about the overall heat of the closet, though.

I have lots of airflow inside the room, circulation rather, but I'm not really getting new air in there when the door isn't open--which it is several times a day. I also have co2 tanks that come on three times a day. Do I really need *new* air or can quickly self-circulating air with co2 addition and opening the door several times a day suffice?

Thanks again for your feedback!

Yessir- Like I said, a closet that size? Opening the door a few times a day would suffice.

I started in a 5 by 5 closet with a 600 watt hps, and opening the door a couple times a day during the light cycle was all it needed. I keep in mind that every closet is different, however.

As long as I kept a fan moving over those leaves, things stayed tolerably cool enough.

If you are adding C02, the plants like the temps between 85-90 degrees anyway, toasty, because it increases the rate of leaf respiration . This makes the C02 supplementation more effective.

I ran a dryer ventilation hose from my floor a/c vent into my closet. I leave one door open all the time about 4 inches. Doors are still covered with a dark sheet.
It has worked pretty well keeping things cooled down.