Neep help with Grow room re model/fixing ventilation.

Currently running 2x 1000w HPS (vented with 4" elicent150cfm) and using a 6" elicent (300cfm) on a phresh philter to pull hot air out of the room. I dont think I am am getting nearly enough air into or out of my room. In the winter things are fine, but even on a warm day, it can be 80-85 in there.

Where I live, it gets fairly hot in the summer. 90 is norm, sometimes over 100.

I really need some help from a pro here.

I am either thinking of upgrading the ventilation, or getting a portable ac and c02.

I am gonna add some sketches I did in paint of my room layout, the first is how I have it set up now, and the second is how I plan on setting my lights up when i throw another 600 in there, I have 2 1kws running atm, but also have 2 600w and another 1kw lying around.

I will take some pics when lights come on at 5.

ANY help or insight is very much appreciated. I don't personally know any other indoor growers, so I am only learning from my mistakes and what I read online. It can be so frustrating.


Should also add, plants are in dirt right now, but as soon as they finish next crop will be a RDWC setup.(and I do plan on chilling the water)


Thanks again
.Current layout

Planning on hanging another 600w in the middle like so:

Without air conditioning, you cant really expect too much below ambient temperatures with such low CFM fans.

Air conditioning is expensive and so can a Co2 setup, let alone sealing the room too.

Might I suggest upgrading the fans you have already, or trying your hand at water cooling your lights instead?

Is it possible for you to vent some of the houses A/C to the room your growing in?

I dont think you should pull air from the attic to put back in there after. Put the intake for the air cooled hoods where there is cooler air. Other than that it seems good.

researchkitty said:

Without air conditioning, you cant really expect too much below ambient temperatures with such low CFM fans.

Air conditioning is expensive and so can a Co2 setup, let alone sealing the room too.

Might I suggest upgrading the fans you have already, or trying your hand at water cooling your lights instead?

Is it possible for you to vent some of the houses A/C to the room your growing in?

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Hi RK, thanks for the reply.

To be honest, I would rather go the simple route and upgrade my ventilation, I am just worried that when temps get to over 100 in the summer, if any amount of ventilation would be enough (how cool can I get my room, when the air coming in is 100?)

And I don't have a house ac, i have a swamp cooler that keeps the house cool enough, but would not work for cooling the grow room ( swamp coolers need constant circulation, grow room would need to be wide open at all times)

Even if I upgraded to a 10 or 12 inch fan, would I be able to cool my room with it when temps are 100+ outside?

alexonfire said:

I dont think you should pull air from the attic to put back in there after. Put the intake for the air cooled hoods where there is cooler air. Other than that it seems good.

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Hello Alex, thank you for the reply.
I will look into pulling air from a different (cooler) source, its not going to be east the way I have it set up now, but I will see what I can do.
But Im not completely sure that would solve my prob. My light hoods usually dont get to how (can hold my hand against them, warm but not hot) I think the problem is the warm air from out side coming into my room.

as promised, pics of the grow room. It was hard to get good pictures, but i did my best.

And just to keep everyone's attention.... some bud shots
10 weeks flower. On right is babba kush, on left is a strain I grew from seed. The seeds were given to me buy a guy teaching a grow class, he told me what it was but I forgot.

Close up of BK

Close up of ?

its 78 degrees in my grow room..... Would be great, but lights dont come on for another 30 min! Should go up to about 85-90 once lights come on :X

wowzerz said:

its 78 degrees in my grow room..... Would be great, but lights dont come on for another 30 min! Should go up to about 85-90 once lights come on :X

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So Upgrading my fans will or will not solve my problem?

I can tell you right now 300cfm is NOT enough for 2x 1000w lights as this is what i actually run. I run one 449CFM 6" vortex fan to cool 2 light, one is ON by day the other by the night.. right now the A/C is not running and the temp is always 85+ in the room and the light burn my plants still at 30inch away ... :S

sounds like you are having the same temp issues as I am.
So can someone chime in here? Will upgrading ventilation be enough in the heat of the summer? I do run lights at night ( 5PM to 5AM) but it can still be hot well past 5 in the summer.

well I made some changes in the grow room. High temps were (literally) killing my plants. I added the 600w in the middle, and have them in line now (as in the second sketch of my first post) On the advice of Researchkitty and Xan2, switched out my 6" ventfan and filter. Upgraded to a 781cfm 10" can fan and 1000cfm phresh filter. moving some serious air. Also planning on doing as Alexonfire suggested and pull air from under my house to cool the lights. (also upgrading that fan from 4" to a 6") I really hope this solves my temp issues.

well things have been running a bit cooler, but its still around 75-80 in there, once spiked as high as 84.
What size passive intake should I have? the fan is 10" 781 cfm

wowzerz said:

Hi RK, thanks for the reply.

To be honest, I would rather go the simple route and upgrade my ventilation, I am just worried that when temps get to over 100 in the summer, if any amount of ventilation would be enough (how cool can I get my room, when the air coming in is 100?)

And I don't have a house ac, i have a swamp cooler that keeps the house cool enough, but would not work for cooling the grow room ( swamp coolers need constant circulation, grow room would need to be wide open at all times)

Even if I upgraded to a 10 or 12 inch fan, would I be able to cool my room with it when temps are 100+ outside?

Click to expand...

Even if you upgrade to a fan over 400 cfm it will still not cool off the grow room. The fan upgrade is a plus but what you really need is an air conditioner if the temperature reaches 100 degrees.

Get an A/C dude, the temperature is going to be hot from the ground also if your temps are reaching 100, trust me.

Its a little late for that. I was trying to figure that out earlier on in the thread. And on the advice of everyone that posted decided against the AC+ co2 route and went with more vent.
I have also moved back my light schedule, they now turn on at 7PM and off at 7AM. Yesterday It was about 85 (hottest time of day,outside) where I live and at 7PM when the lights came on it got up to 84(in the grow room) but then soon went back to about 78 and stayed there.
I think I need to make my passive intake bigger. Its about 8" x 12" right now. And this fan is trying to suck my panda plastic wall off. there is a lot of negative pressure in there.
Any ideas?