Co2 and Temperature

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Co2 and Temperature

Postby kushman » Tue May 16, 2006 10:22 am

I have a room that is 1440 cubic feet. I am using a C.A.P co2 generator keeping the room constant at 1500ppm and because it produces heat, my temp goes up to about 89-92 degrees. I am currently in veg and I leave the co2 on for 12 hours of my light cycle and turn it off for the other 6 hours which happen to be the hottest part of the day.


The temps in the room are:

85-92 for the first 12 hours when the co2 is on

75-80 for the remaining 6 hours of the light cycle

68-73 during the 6 hours of darkness


My questions are as follows:

1) What temp should the room be when using co2?

2) Is there a problem with running it 12 hours out of the 18 hour veg cycle?

3)Is there any potential problem with my temperatures?
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Co2 and Temperature

Postby PapaSmurf » Tue May 16, 2006 12:32 pm

just add alil more ventalation. you should really try to keep temps below 90.
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Co2 and Temperature

Postby Sawdy » Tue May 16, 2006 1:54 pm

How are they growing??? quickly?? with CO2 injection they should be going crazy. If not the heat maybe slowing growth.
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Co2 and Temperature

Postby rollinstoned » Tue May 16, 2006 2:29 pm

Is a 88 or 89 a really bad temp.? Thats what my small box runs at and the plant doesnt seem to be slowing growth.
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Co2 and Temperature

Postby Sawdy » Tue May 16, 2006 2:58 pm

Well im in a hot area of Australia, and im setting up my grow room now. I am very concerned about heat! Not sure how hot it can b but i believe low 85 with CO2 is OK. Apparently they can withstand temps a bit hottter when using CO2.

But this is only research i have done for this current grow setup, havent put this into practise yet.
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Co2 and Temperature

Postby kushman » Tue May 16, 2006 6:00 pm

Sawdy wrote:How are they growing??? quickly?? with CO2 injection they should be going crazy. If not the heat maybe slowing growth.


they seem to be growing pretty quickly... I am actually thinking of getting a co2 tank with a regulator as well and then the co2 generator won't have to work as hard. Also if I do that the co2 tank would last a hell of a lot longer.
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Co2 and Temperature

Postby Lady Zandra » Tue May 16, 2006 6:10 pm

Your temps should be lower during veg-- then higher (slightly) in flower... 70F-8F is optimim for veg.. and 75-85 is ok for flowering...
You need some ventilation-- an oscillating fan IN the room, a fan that brings IN cool air (at floor level if possible) and a venting fan as high-up as you can-- preferably at light level (in line-- even better!)

CO2 is better at lights-off when you flower-- lower temps are better....

Good Luck!
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Co2 and Temperature

Postby coolrnyu » Tue May 16, 2006 7:43 pm

Lady Zandra wrote:CO2 is better at lights-off when you flower


what she said
"i smoke two joints in time of peace, and two in time of war, i smoke two joints before i smoke two joints, and then i smoke two more"
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Co2 and Temperature

Postby Sawdy » Wed May 17, 2006 1:43 pm

Plants do not use CO2 when the lights are off (dark) period. This is because CO2 is part of photosynthisis. At least all the grow guides i have read state so, Therefore the co2 only needs to be on when the lights are.

In my setup i plan to have refrig air cond regulating temp am sourcing a portable 1hp now. I will prob spend bout $250 AUS.

I have just ought CO2 injection am not sure at what age i should introduce it tho, i believe it is most effective when in flower.
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