M8 don't worry so much about low humidity... It can do no harm.... Your humidity will rise as your plants grow & start to breathe anyway.... Once that happens watch out for high humidity... Especially when your girls are in flower as bud rot can & will set in... (if humidity is too high that is)..
Agreed, but before bud formation, optimal RH% will do nothing but boost plant performance.
Don't worry mate, I was in the exact same situation as you 2 months ago when I started my 1st grow. I had soaring 35ºC and 25% RH. I almost quit entirely, pulling my hair and kicking myself for buying a 600w HPS and not the 400w... and the noise my fan made to keep it ALMOST bearable was like a jet engine. This little trick saved my butt, and I am now 3 or 4 weeks for tasting my very own grown crop
And so will you!
On another known forum I concocted a cheap easy humidifier. I won't link you up to it because I don't know if this forum allows cross-linking. I managed to drop temps by as much of 15ºC and raise RH% 10-20%. In doing so, as my main concern is sonic stealth, I was able to turn down my fan considerably.
I found that an open bowl evaporates very very slowly, as water retains the heat, but not to a point of constant evaporation. So I thought up this idea. I tested thoroughly with many different fabrics.
Get a piece of cloth that is not very dense and lets air through easily. Preferably organic like wool or flannel, so it soaks up water really nice.
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Hook it up over you air intake port (mine is passive), then put a bowl of water underneath. I also have a 6" fan under the cannopy, but also helping direct air in.
The fabric soaks up the water, then airflow + heat keeps a constant rate of evaporation, In my tent it got up to 2,5L per day!!! Before flowering, I could easily keep RH% mid 60's.
But, when the buds started growing, you don't need this at all. It also works wonderfully as a bug/particle filter.
Try it, hope it helps and saves you money!
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