@absolutgrow, thanks bro, I actually already have or tried everything you mentioned: my exhaust fan is 720m³/h (my grow box about 0,9m x 2,4m), 2 smaller ones to bring in fresh air from the outside (about 350m³/h).
The temperatures was fine from the beginning to week 4, I guess because my humidity was set at 70% and as you say, it helps to cool down the temp.
When they started to flower, I changed for 50 to 55%, the temperature went too high, it's summer and we had 2 heat waves, so I bought 2 cooltubes, it probably helps but it's still too hot... Don't want more humidity for the risk of mould again exactly as you said... And I can't move the box, it's outside in a woodshed. I have a good isolation for winter but the air comes directly from outside so if it's hot outside, you see.. 😅 I already thought about the LED but can't afford it yet, I will probably invest for the next grow but also wondering if I really should because next grow will be in winter and that heat produced by my HPS would be useful ! I'll keep growing with what I have and learn from this first experience ! I'm gonna follow your diary and see how it goes ;)
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