Originally Posted by RockinRobot
I live in Florida and mold is an issue here(not just in plants). Every article I ever read said 60-70% during veg but RH should be below 60% for flower and most prefer 50% for flower. According to the VPD chart, for proper VPD, I would need to keep my room at 64 degrees at 50% RH and 66 at 55%. I already have to run a dehumidifier to keep RH low because AC can't keep up with our 90+% humidity.
Temperature control is an extremely important variable of the equation in regards to avoiding problems such as mold when running your rooms at a high rH. Especially when the lights go off. From what I understand from researching and listening to many peoples opinion's on climate control in your rooms, flower in specific, is that the biggest concern is keeping temps down when the lights are on, and while this is definitely an issue that must be addressed. I do not hear many people talking about the the benefit of keeping the temps up (or relatively the same) when the lights go off. Maybe they do, like I said I just do not hear much about it. This, maintaining temps during lights out, becomes an important factor when running a high rH. While the lights are on and the temp is up to say 80F running a rH of 75% shouldn't pose a problem to your plants because the air is at a high enough temp to "hold" the amount of water vapor in the air and thus not condense and cause dew. But.....when the lights go off the temps will, if allowed to, significantly drop. At this point maintaining rH at 75% poses a significant problem. If the temp drops air losses it's ability to hold the amount of water vapor that 75% rH can present it with. So, as a result the water vapor condenses into dew and in very poorly controlled environments guttation may occur as well...more than likely result of this unfortunate (irresponsible) chain of events....MOLD. Given time...LOTS OF MOLD. This problem can be solved by properly maintaining temps to coincide with rH when the lights go off.
I would suggest rockinrobin, in an effort to be more economically efficient, is that you do a bit of research into which strains you grow and choose one(s) that grow best in hot and humid environments, they are definitely out there. Then settle on a nice hot and humid VPD in the beneficial ranges and use that hot and humid Florida air to your advantage. Pull in outside air and use it to maintain the high temps and rH, the closer the conditions you choose to maintain are to the outside conditions the less your environmental control equipment will have to work to get the air where it needs to be. Look into lung rooms if you already haven't...they are quite effective setups for utilizing this particular methodology.
Pretty cool thread thats building right now that has some solid info about what they are and how to design them.....
I say all of this with a grain of salt. Your yields using what ever methods you have been using may very well be quite impressive, I have no clue, but...it just seems to me from the little bit of info you've shared that you're fighting against the current swimming upstream in an effort to get those yields (whatever they may be), learn to go with the flow man. Lung rooms are fucking awesome.
Peace and CBD grease.