The transition settings will change the behavior of the fan. Rather than going directly from the "off" speed to the "on" speed when your temperature or humidity thresholds are reached it will ramp the fan speed up. I have both of mine set to one up from off, so 2F or 2% RH. My thinking is that I don't necessarily want my fan to ramp immediately up to 10 when humidity goes from 60 to 62, that's unnecessary. But I do want my temp and RH to stay close to their settings, so I would rather have the fan ramp up quickly if humidity keeps spiraling. At that setting, every 2% RH over my target will turn up fan speed by 1, which does a great job controlling rh and temp.
I've also got an inkbird humidistat hooked up to a small humidifier in my tent and a large dehumifier outside. The humidifier kicks on at 3.5% rh below my target, the dehu kicks on at 7% over my target. The idea is that if it's 7% over, that means my lung room is surely too wet to be drying my tent off any more. The dehu will lower lung room's rh enough to get my tent rh down, and the fan will be blowing at near max to quickly cycle the air.
Here's 24 hours in my flower tent, I've got my controller 67 set to 76F / 60% rh and my inkbird at 60 with 3.5% down to turn on humidifer and 7% above to turn on dehu. It does a pretty good job, you can see where I turn down my AC for the evening (luckily for my girls I like it cold at night). My lights are at 75% right now, I'm hoping to keep my daytime temps below 83 at 100% lights. Being around 79 means my fans are running at 5 or 6 most of the time.
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Good luck, man! It's harder in some ways than I thought it would be but easier in others. I just had a really trash tent that I should have binned months ago, but this one is looking a lot better. One of the big changes I made this time was actually getting the AC Infinity fan and the controller 67, which has made it so much easier to maintain low temps and the proper humidity.