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Mephisto Genetics Chemdogging, Sour Livers, Fantasmo Express in RDWC

I have the same issues, one hour the humidity is low, next it's WAY up and it drives me nuts. As winter approaches it gets worse.
I think I may have to invest in some Inkbirds and a space heater, but I really need to have just one big tent to do that. I can't deal with four smaller ones if it's gonna be like last season.
All you can do is the best you can, keep the air moving with the higher temps and humidity.
 
DAY 41
Nutrient 1.8 EC; 21/22C; pH 6.0
Environment: Day 27C RH 63%; Night 21C RH 75%

Started with Shogun PK Warrior today @ 0.5ml/l
RH is crazy high during lights-off so I have placed my dehumidifier in the tent (it just fits between the DWC pots). The problem is, it raises the temperature by at least 3C so I have timed it to come on for the 4 hour period when the lights are off. Later on in flower I might run it during lights-on, to keep RH below 50% but that will mean in-tent temperatures of 30C. It's a balancing act between RH and temperature.

Here are some pics from the tent today:

View media item 19769
View media item 19770

Defoliating the lower leaves will help with the humidity. get a small fan to blow from underneath.
 
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