Low humidity in tent

Hi all. I have some ILGM white widow autos that are doing i think pretty well. 3 at 5 weeks veg and 1 at 4 weeks veg. In a bit of a $ crunch but is there a trick aside from the obvious get a humidifier to raise the rh? Ive already put the bowl and wet towel but rh

remains at about 47% to 50 %. I think i want it higher yes? The girls are in a 3 x 3 grow space. The temps are avg 72 to 80 f.
I have co2 bag hanging in there as well. 4 in inline exaust and a couple of fans. Or…maybe im just stressin?

I have used one of those cheap diffusers you put oil in to make your house smell good. Just plain water and it vaporises it like a humidifier. Works great in small areas.

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Right on thanks for the tip.

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Do you have an exhaust fan running nonstop? Put it one a timer or a thermostat and that will help to raise RH a bunch. But your current RH is not bad.

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Yes the exaust runs 24/7 now. Lights are currently set at 18/6. Could i just move the fan to run the same as the lights? Or should i put it on a separate sced.?

Temperature is great humidity not bad I think I would roll with it. Plants look happy. good luck

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Here is a great guide to go by provided by @imSICKkid in another post. Try to stay within this VPD chart. stay in the green.

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You can get something like this to automatically turns the exhaust fan on and off as the humidity gets to high or low.

Or a new exhaust fan that controls the environment like this one

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This is what I do and what I would suggest. It’s a more passive approach to maintaining environment and therefore less expensive. I use a temp controller for my 6" and have a 4" on a timer. That way when lights out and temps don’t reach trigger I get some air exchange.

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Thanks all the good tips all.