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I want to keep RH up during flower actually. But going to have a lot of fan power as well.
Tent is in a garage. I have a humidifier in the tent because its an arid climate here and I am keen to keep RH and temp in a VPD sweet spot. And I have a dehumidifier in the garage to reduce the moisture of the structure of the garage. I exhaust the tent air right back in the garage instead of outside because I don't want to waste the heat i created in the tent in the winter. In doing that the moist air from the tent goes in the garage which is bad. And the water collected by the dehumidifier goes right back in the humidifier. Its a nice closed loop system of water that I reuse over and over. I empty the dehumid bucket in the morning and dump that water back in the humidifier.
Also have an RO filter for my plant water source.
Holding it in the VPD sweet spot is a good idea!
Personally I‘ve always plants in different stages of life in my tent and I noticed, that my ladies grow very well in the range of 40-50% RH .. temperature 25-28 C (77-83 F), when lights out in the low twenties. I didn‘t experience a benefit holding the RH higher ... I can’t swear by it but I have the impression that this environment provides even a better growth during vegetative stage and preflower than holding the RH high ... maybe during the first or additionally second week of life, a higher RH could be an improvement ... but these are only my personal thoughts about it.
I live in a more humid and probably colder zone than you and a dehumidifier is a must. It also helps to rise temperature during the colder season and the collected water is as good as RO water. A great way to save resources .. these days the plants in my tent need more or less 4 l of water daily, 3 l out of the dehumidifier!
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