My RH is at 20 ... what is recommended??

my temps have been high, but i think im getting them down to 82-85. but i was wondering where my humidity should be at. im doing a soil grow.

Thanks for your help

higher humidity. I try to keep mine at 35-40%, as for the heat just make sure the room is well vented to take in cooler air and taking out the hot.

You should aim for the following humidity.

30 - 50 % during flowering (helps produce more resin and prevent mold).

50 - 70 % during veg.

swansong said:

You should aim for the following humidity.

30 - 50 % during flowering (helps produce more resin and prevent mold).

50 - 70 % during veg.

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ouch... so how can i get it higher to where it needs to be?

buy a humidifier

lower the temps to increase humidity, and slow your air vents down. A fan speed controller is essential if you want proper control over your grow enviroment.

humidifier or leave a bucket of water in ur room so that it can evap .......

tech209 said:

humidifier or leave a bucket of water in ur room so that it can evap .......

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i put a bucket of water in last night, no changes yet

swansong said:

lower the temps to increase humidity, and slow your air vents down. A fan speed controller is essential if you want proper control over your grow enviroment.

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what do you mean by slowing down air vents???

got a fan blowing directly at the water???? try'd misting the air a few times to see if that bumps it up?...........

i put the bucket on the bottom of the room, no fan blowing on it. i can make that change easly though.

go for it and let us know whats sup after that............

alright, ill play with it tonight and let you know.

Thanks

koo good lookin till then blaze it!..............

CaliMedicated said:

alright, ill play with it tonight and let you know.

Thanks

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You may also get a little more bang for your buck if you float one of those big honking car washing sponges on the top of the water in your bucket, and direct the fan at that. This is the essence of a swamp cooler where air is cooled by flowing it past an evaporative "wick", and it works well in dry, hot environments. You can probably find a small, cheap swamp cooler on eBay or somewhere if you want to get fancier with a plug-in unit, but for that price you could probably just buy a small humidifier.

haha swamp coolers. I use to live in a house that didnt have AC but only swamp coolers, the house always seemed real humid inside, was prob a great place to grow.... damn! Cheers ya digg.

Snake said:

You may also get a little more bang for your buck if you float one of those big honking car washing sponges on the top of the water in your bucket, and direct the fan at that. This is the essence of a swamp cooler where air is cooled by flowing it past an evaporative "wick", and it works well in dry, hot environments. You can probably find a small, cheap swamp cooler on eBay or somewhere if you want to get fancier with a plug-in unit, but for that price you could probably just buy a small humidifier.

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im on it, thanks snake. i read another post about RH that you wrote and you seem toigive good avice. im going to go grab a sponge today. ill post up tonight my results. how long do you think tell i see results from this process?

CaliMedicated said:

im on it, thanks snake. i read another post about RH that you wrote and you seem toigive good avice. im going to go grab a sponge today. ill post up tonight my results. how long do you think tell i see results from this process?

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The main thing a big sponge on top of the water will do is provide a lot more surface area for water to evaporate from (assuming the sponge stays wet as it should). This allows more water to get into the surrounding air to raise RH compared to just blowing the fan across the top of the water in the bucket. But this approach can only do so much depending on the room size and how well ventilated it is.

If you have a large and well ventilated room, and the air from outside doing the ventilation is very dry, then you'll have a constant battle to keep it hydrated with the bucket and sponge approach. But if you can control the ventilation by adjusting exhaust fan speeds, throttling down the inlet ports, etc., then you should be able to get RH up to the 40-60% range and keep it there as long as you keep adding water to the bucket.

If this isn't enough for your room size then a continously-running humidifier may be necessary (or a commercial swamp cooler which would be a lot more efficient than the bucket and sponge approach).

The humidity in my last Grow room stayed between 20-30% and it was fine loads of crystals. I would worry about it personally.

air pump + air stone in the bottom of the water bucket is more effective than a sponge in my experiments