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I am new at this, but I shoot for ~40%, and make certain that I have excellent air circulation though the entire canopy. So far, no mold on my indoor grows. With good air movement and stable RH, you might get away with ~50%. but I don't have enough experience to be sure. I think intermittent excursions to high RH can be very risky too, so you need to see what is going on during lights out. If RH spikes, that could be a problem. Any time I have seen guttation after lights out, I have had mold. Always outdoors so far, but guttation is a very bad sign.I have a growroom question/problem.
I knew that this grow would go into the cold season. I thought that when it got cold, it would help keep temps fairly even and wouldn't have to run a heater in the off period or at least as much. It's working on that point.
The problem is the humidity of the off cycle tent/s. It has tended to rise, which is normal. I could keep this schedule and fix the problem easily with the AC Infinity humidistat controlled exhaust fan in my 3 tents, but we all know that's outta the question at the moment.
I'm lowering the dehumidifier to 50% and see how the current off cycle tent does.
Some are getting close to harvest......maybe two weeks. What is the highest humidity, I can be safe from mold on off cycle with an average temp of 71- 68*F?
This run is doing far too well to screw it up now.
My challenge indoors is the opposite, my RH would be too low without help. Good luck with it.