Quote Originally Posted by TurboALLWD
co2 enrichment is normally done in a closed room. It's kind of pointless to pump co2 into a room that uses ventilation to control air temps. Maybe if you had a co2 generator, but with a tank you'll be filling it up twice a day just trying to maintain 600ppm's lol. My numbers might be off but its really not cost effective imo. Do it right and seal the room, air cool the hoods, put a window unit in or split unit. I modified a floor unit into a split unit with ease...

Temps are suppose to be higher with co2 but I only run 80. Some people run 85+. My co2 level is set at 1400ppms during the day. No co2 at night. Hope this helps. Keep doing research. :jointsmile:

Definitely want to run CO2 in a closed room. Remember CO2 is heavier than air, so have a fan blowing it from the floor. If you have problems controlling heat, you can have a small exhaust at the top of the room as long as it does not have a high flow rate. I personally use 3 small pc fans exhausting heat using what I like to call a "top to bottom" method. Meaning my fans are built into my framing. Heat from inside the grow room takes a trip through a hole in the top of the ceiling and exits out the bottom of the wall on the outside of the room. I can still maintain perfect CO2 measurements using this method. I grow using strictly CFLS and I don't really have a problem with heat. I noticed you use a 1000 watt HPS? Good luck cooling that sucker! lol.


I maintain temps between 85-95. I control my CO2 with a bubblemeter AND a CO2 reader ($200!), just to be sure I don't burn them. I run about 1500ppm during veg(after they get a few leaves), and 700-1500 during flowering. 1500 during the first 6 weeks, 700 during the last few. I only reduce during flowering, bc supposedly there is evidence that proves co2 during flowering reduces potentcy. I have a fan in the center of the room blowing towards the ceiling. The CO2 hose is tied to the ceiling, above the fan. My room was also sealed with silicone and plastic sheeting when I framed it (air tight!). No CO2 at night, because plants give off CO2 at night, and use it during the day. So remember to exhaust at night especially. Did I miss anything??

Just have to find what works for you! Like turbo said, RESEARCH!
sum1cull911 Reviewed by sum1cull911 on . Need Co2 advice Just picked up a tank of Co2 and a regulater and need to know when and how it will work best...setting etc. want to try to do it right the first time for sure.. lites run about 18 hours a day in this room. We strung some 3/16 hose into the T5 room and drilled holes about 2 inches apart under the T5..when would be the best time to run Co2 in this room ? also do we need to turn the fans and can fan off when we turn the Co2 on..? Main grow room under the 1000 sodium lite we where Rating: 5