Not another Temperature/humidity question

rojimmy53

Member
Yes another one. I have done extensive research on this subject and am slightly confused and was hoping there were some people who could kind of set some info straight. And potentially save me a bit or work.

Ok first off I am running 5000 w of HPS lights (2 dimlux 3 old school xxxl's) in a 20x11x8 well insulated garage area, 5 separate beds, lights are not cooled and have no glass on xxxl's. I am in soil. The garage is separated from the house. I have an exhaust fan of 840cfm's on a charcoal filter. I have an 8 in intake, active to help cool room as my outside temps are low and an 10000 BTU AC unit which gets vented outside by a 6in ducting. I am running CO2 at around 1100-1200ppm, I am not exhausting while doing so.

The room temperature daytime (lights on) is typically around 75-85 (ambient room and like soil level on beds) all day, but I'll get 90-95 directly under one or two of the lights/beds towards end of day cycle. The humidity during lights on is like say 50-65% for the first hour or 3 (after watering) and then sinks to like 30-40% sometimes as low as 28%, I AM IN COLORADO. Lights off I run 62-70 degrees and 40-50% humidity. We are talking DIRECTLY under lights at hottest point, middle of the bed for the 90-95's.

With these parameters does it seem like I should have more exhaust fan?
Am I ok running hot ( 95) under a few areas with the CO2? esp. if room is still only like 80 degrees? Is this going to effect yield, THC level etc.... I have heard temps up to even 95 COULD be ok running CO2, not sure of this?
I have another AC unit I can hook up, it'll just be a bit of a hassle to hook up exhaust right now and would love to avoid doing it if it is not utterly necessary. I know I"ll need it in the summer but really did not think I'd need to use it in winter.
 

piratebug

Well-Known Member
For me, if running C02, for weeks 1 - 3, 900ppm @ 80F/65RH, weeks 4 - 6 1100ppm @ 85F/65RH, weeks 7 - finish, 1000ppm @ 80F/60RH. A higher RH is needed to allow the plants to open right up, to intake, all that extra Co2 they are getting. If you restrict the Stomata from fully opening all that extra C02 will do nothing! And, I don't care what anyone else might tell you, running 90+F in a C02 enriched closed room is not good, period!
 

rojimmy53

Member
For me, if running C02, for weeks 1 - 3, 900ppm @ 80F/65RH, weeks 4 - 6 1100ppm @ 85F/65RH, weeks 7 - finish, 1000ppm @ 80F/60RH. A higher RH is needed to allow the plants to open right up, to intake, all that extra Co2 they are getting. If you restrict the Stomata from fully opening all that extra C02 will do nothing! And, I don't care what anyone else might tell you, running 90+F in a C02 enriched closed room is not good, period!
Curious as to what lighting YOU are using? So my 90's seem to occur at only one or two of the canopies directly under lights, room temp seems to maintain around 80. I have what I would think is great air-flow...3- 18" wall fans and 2-16" standing fans at each end of room all oscillating of course, but still see these 90's. So it would seem my humidity is way to low for optimum performance of stigmata opening. So a humidifier seems like a purchase I need to make.
 
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