I have read that research suggests that the most gains are seen with temps of 90-95 degrees and 1500ppms... some others say 85 degrees is optimal temps, while others still say that 75-78 is ideal...

who grows with co2 sealed rooms and what are your experiences with temperature?

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I dont use CO2 but i do know this, DONT run with 75-78. Thats ideal for normal CO2 rates, you need to turn up the heat just a tad when you turn up the CO2.

Im not sure about the 85 or 95 though. Id just stay right in the middle if you dont get any good replies. Stay right under 90, and if they start to wilt you know what to do. Good Luck, Lamp.

ya i know that when the temp is raised it increases their respiration, and allows them to use more co2, but im just wondering if it would be possible to run em that high, and even have ppms of co2 at like 2000 with even higher temps... unfortunately there is not much out there about documenting co2 and the differences it really makes and under what conditions

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1500ppms is plenty


2000 is overkill...may harm plants and is just wasteful, imho

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i agree but what i am trying to figure out is what is the ideal temp and ppm for running a room with co2, and do increased levels allow for higher temps or is there a ceiling to what the plants can use?

the problem is that right now with my room vented it stays about 78-82 degrees but when i turn off the vents and seal the room the temp goes up to about 92-95 degrees.. and i just bought a dual co2 reg, 2 tanks, a sentinel co2 meter and some other goodies to run co2, so i am trying to figure out if i need to get an ac and run it in intervals into the room, or if i can just run an intake once an hour for 15 mins to keep it in the high 80s low 90s..

but i cant find many documented grows with proper co2, and there is not a terrible amount of reliable info out there, so thats why im here hehe

the guy that goes around grow rooms in canada the urban grower has documented rooms easily running 1800ppms so im confused

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wow! i have the igs220 but i want the sentinel chhc-1 SO FREAKING Baddd...i have a few sentinel controllers and digital timers...i love those things...freaking bad ass.

In my humble opinion, when you said you seal up everything you get 92-95F or somewhere around there...that sounds fucking perfect just about to run that 1500 ppms

optimal co2 in normal air outside is around 300 ppms...this is why they tell you to run 1200ppms on your system and with the intake coming in from the outside it will add and give you 1500ppms total

As far as your ceiling question, im not 100% sure, but im sure there is a ceiling....and im thinking that would be around 2000-2500ppm....but like you said some growers claim success with that...but i think in order to benefit from 2000ppms you need to have everything right especially temps. This is another reason why I dont think its worth the cost of wasting gas nor do i think you 'll see any more benefit from using the 2000ppms as opposed to the 1500ppms...but then again i could be wrong. Once you supply it with that many ppms of co2 you have to make sure you are feeding more, they have adequate lighting to be able to digest all the co2 in photosynthesis process.

I would run cycles of 1500ppms....let the plants soak it up for 30 mins to 1hr with the exhaust turned off, while leaving the intake turned ON. Then i would cycle the old used up co2ish air out (exhaust on) and refresh with more co2.


its always trial in error. The key is dialing it for your specified op.


Hope that helps

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i just got the cppm1 but if it turns out to be a good quality product, i plan on picking up a few timers and other things from sentinel.

now why would i intake and exhaust more air? the plants will use up the co2 and replace it with oxygen, which would make the controller pump out more co2 to maintain the levels... it seems to me the only time i would want to intake or exhaust is if the temps got too out of control right??

and man if low 90s is ideal for 1500 ppms then im gonna have an interesting grow hehe im excited!!

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that is just my opinion of course


and the reason i would still intake is because fresh air is fresh air. you would exhaust at the end of every cycle to exhaust old co2 air. that is when a controller would then kick in to push in fresh co2 @ user desired levels


sure you could only exhaust when the temps are too...which normally does...but some folks do it x way others do it y way and others the z way.

honestly if you have the right controller i would definitely let it work out for you. thas why i like my igs220 so much.....but i want the sentinel chhc-1 that is one baddddd bitch. My igs220 is the same thing, except i dont have an external sensor device/probe thingie and i put tape over the lights cuz i dont want shit to hermie. The CHHC-1 on the other hand does

here's the CHHC-1 demo:



hell i may just 2 of these...i want one for my cab for sure.

the sentinel drt-1 is a bad ass recycle timer too.....programmable down to the second! love my sentinel gear.

i dont think you'll be disappointed

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i could probably exhaust a couple times a day for the hell of it.. tweak it a bit..

ya that is a bad mofo, i just have the cppm1 but its still nice, now im wishin i woulda spent the extra to pick it up lol oh well, i can get one for my other grow i suppose hehe..

so u think the plants will be thriving at 90-95 and 1500ppm with rh in control?

who else has some experience with co2?

thanks again loudblunts +rep

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anywhere from 85F on up is good imo...(any less would be too cold)

i wouldnt go higher than that 95F though


and no problem, glad to help

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