Quote Originally Posted by denverbear
We think the room is sealed pretty good...we used the plastic reflective mylar and gorrilla tape to seal from top to bottom...when the 6 in can fan is on pulling air thru the charcoal filter thru the lite into the can fan blowing out the window the walls are pulled inward pretty good....what we are thinking is that if we run the co2 for the first 15 minutes or so when the lites come on we would use timers to shut off the fans and the co2 on and where wondering if doing this every for hours thru the lite cycle would help meet our goals or do we need to use more often ect..the room stays around 75 when the lites are on and humidity varies from 34 up to about 48 pct during the day......we do not use any air conditionar or heat other then the fixed air blowing thru room...the big lite comes on about 5pm or so and runs until 5am....trying to run the big lite in middle of nite when rates are cheaper(is this a good idea ?)
thanks again as I am really starting to get the hang of this but know I have so much to learn and enjoy talking to you all about what helps us all..

I hope I have given enough background on this project...

retired and happy.

Timers with the fan on and co2 off and visaversa... sounds like a good idea to me. I don't see why that wouldn't be beneficial. I would increase the co2 to fan time ratio though. (Maybe a half hour, instead of 15 min.) Running lights are up to you, but remember light leaks are easily seen at night. Depending on where you're located the cool winter night temps will help keep the room cooler when the fan is off and the co2 is running. Other than that, you're on the right track.
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