Well fuck. I came out this AM as soon as the lights came on....temp 81, humidity 62%....
I can't remember who suggested switching the light cycle, but it's a really good idea.
god damn. I am running 3 fans to circulate air in the closet......on 4" fan intake cool air from under my house.....one 4" fan taking hot air out intoi another room......the grow room feels coolish.......but my temps are still high.
Dedicate BOTH those fans to PULLING the hot air out. The cool air, as long as it's unobstructed, will follow. Make sure the cool's being pulled in from low and the hot's being pulled from high, given the laws of thermodynamics and all.
After 1 hour 40 of light, temps are already 88 with humidity at 67%. I put a dehumidifier in, but it isn't doing shit. I figured my my hygrometer was broken. Took it inside to AC'ed house. Temp 70........right on.....humidity 73%....I doubt my house is that humid. There is no condensation on anything. So...I am off to Wally World this AM to buy a new unit. Maybe that was my problem. Anyway...we'll see......
P.S. Took the HEPA off per Seamaiden......what other filter might I use??
If all you're worried about is scent control, then carbon filtration would be the ticket.
Here's what I would do in your situation, presuming the box
isn't being heated via solar energy:
1) Take BOTH 4" exhaust fans and put them next to each other near the top to pull out the hot air, you want to pull as much volume as possible.
2) Double the INTAKE hole size for each fan you're using. Pulling that cool air in from under the house would be your best bet, but remember, that air is likely to be more humid. For each 4" fan, if you have an 8" intake hole that's pulling in cooler air then the fan won't have to "work" so hard (and generate more heat) to pull the hot air out. Does that make sense?
I believe that once you have your air movement problems solved your humidity issue will be solved as well, accuracy of the meter itself notwithstanding.
I think panhead made a really good, and cheap, homemade carbon filtration unit. If you're slapping one of those on, then you may need to add another fan as that will also obstruct air flow and cause the fans to work harder. It shouldn't be as bad as a HEPA filter, unless the carbon is really packed in their tightly.