Hello, i have a small room that cannot be air conditioned and because i live in a hot climate, even running the room at night gets me a max temp of 92 degrees. i was going to use CO2 to allow higher temps but i'm reading now that CO2 in small spaces sucks because the plants grow too fast. i was wondering if there was any happy medium i could find. a lower ppm on the CO2 so temps can be higher and yield can be a little larger but not too much CO2 so things don't over grow the room. my space for flower is 3x4x6 with a 400 watt HPS, 6" air cooled hood.

thanks.

mG

There are some places where you just cannot grow pot...

Sorry.

my suggestion is to leave it at 92 (that's really not too high) actually it might make them grow better, since the molecules move faster in higher temps...then, since you're height restricted...SCROG it! Primeralives SCROG setup and grow (coments welcome)
read some of the posts, they'll explain how it works in it..really efficient! and for heat, maybe return that 400w, and (maybe) get a 400w with an air duct...High Tech Garden Supply ! that reflector also has the glass shield on it, so the fan in it won't blow away your CO2! hope that helps!

CO2 doesn't suck for small places. Growth is what you want. You may just need to do a little manipulation. I think CO2 is a great option for you. I actually prefer temps of 95 for CO2 based on past experiences. Are you using a cooltube or just a sealed hood? What type of fan are you using to exhaust the cooltube. Are you exchanging the air often? What is the temp of the air you are sending into the room(could be changed if it is cooler outside or your house at night)?

If you look at the last few posts in my cab build you will see how i calculated CO2 wasteage for a similar size grow. CO2 would be about a $700 investment to do right though. The CO2 itself is cheappp...

Why can't you use AC in a hot climate?

Hate to ask you so many questions but if ask half ass questions, you usually get wrong or half ass answers. There are alot of variables to consider...

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i have an air cooled (6") hood with a 6" Eco Plus fan pulling air through the light. it's sealed with glass and tape and it's air tight. I can't use air cond. because there is no room in my tiny room. i have an air cond. outside the small room (total size 3.5'X7'X8') but that doesn't help.

for air exchange, i have installed a rectangular register in the wall between my small room and my main apt. i have a split after the register and half of the 14"X7" opening goes to the 400 HPS drawn by a 6" Eco plus fan (440cfm). the other half goes through a back draft damper, then a suncourt 6" fan (180cfm). That fan turns on when my Eco Plus 4" fan turns on to send air out of my room. I'm using a timer in my tests that turns on the ventilation for half an hour every two hours. half hour on, 1.5 hours off. Unfortunately, and I've discovered that the suncourt 6" fan is not pulling any air even though it's on. the suncourt is running but it's only 180cfm's and the Eco is 440cfm so i assume it's being over powered. The suncourt says it's 300cfm but then you find out that's only if you are using it as a "booster". not sure how to deal with this problem because i can't cut any more holes in my apartment. oh, the suncourt blows tons of air when the 6" Eco is off. The only other inlet is a 4" computer fan pulling through a 4" duct opening.

thanks for the help.

mG

damn dude well glad to know you know what you're doing..."squirrel cage" fans are supposed to be really good for moving air...you can attach a cylindrical AC ventilation tubing to it and link it off from your main AC so it delivers some cold air to it...don't really know what else to suggest...i'm sure someone on this site has some good ideas though!...

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Cool thanks for the detail.. i tried drawing it out but couldn't based on your description. Best of luck...

But, If you are pulling in cool air then the fan config is definitely the issue. I have a 600 in 2 x 3 x 6.5 and can keep it 91 max with no exhaust cycles. With exhaust cycles i keep it 3 degrees above my intake air.

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i have a similar problem... most of the time my temp stays about an average of 75 but high noon i turn my light off, and the ventilation on, but still it tends to reach in excess of 90 degrees

get a small rotating fan with an ion centrifuge. Lasko makes a good one. It will keep the temp cool and deliver clean air. as well it will fit in a corner in your room.

I dont think it will cool any air, if anything it would generate a small amount of heat...

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Grow Cabinet Build
First Grow in new Cabinet C99 X A11