Ways to deal with high humidity in sealed room with co2

hey guys

we have about a 9x5 room that has 2 1000w hps hooked up to a high cfm fan (cant remember the rating right now) it is intake/exhausted to the outside room. we have 3 fans inside the room to circulate air, we had an a/c in the room but removed it because our environmental controller was/is screwed up and was keeping it on all the time and would spill water out the back and get the floor all wet.

so the humidity this morning with co2 was around 85% with temps around 85 as well. The only thing i am thinking of is going and getting a big bucket of that dehumidifying silica beads. Is there anything else possible?

what are your temps with lights on and off? if you have big swings in temp, you'll have big swings in RH. maintain your temps at nite, and your RH will stabilize, imo

if that doesn't help then get a dehumdifier. a small 30 pint will cost you about $200 and will maintain the humidity level exactly where you want it. you can empty the pan once a day or continually drain it with the hose.

If you can afford Co2 then you can afford a dehumidifier, get the ones that pull at least 20L of water a day on continuous flow. Place it up high and run it at 15 min intervals for about 5mins, 24/7. Also run osc fans 24/7.

I have been having humidity problems to, I kicked in a heater but my temps would gt high during lights off, I added in one more fan my exaust is ok just need to put my intake running, think i will be needing a dehumidifier to.

actually cant afford a dehumidifier right now and dont want to buy one because i will most likely be moving in a month

There's a product called damprid...

http://www.damprid.com/moisture-prevention/moisture-absorber/absorbing-excess-humidity

I know you're CO[SUB]2[/SUB]-ing but you could refresh air every now and again? I heard those damprid things drop the humidity by ~2% each day.

AdvancedNewbie said:

There's a product called damprid...

http://www.damprid.com/moisture-prevention/moisture-absorber/absorbing-excess-humidity

I know you're CO[SUB]2[/SUB]-ing but you could refresh air every now and again? I heard those damprid things drop the humidity by ~2% each day.

Click to expand...

yeah i just got some of those just now, i know we could but we would probably need a better environmental controller than we have?

A dehumidifier is best solution make sure plenty of fans going 24/7. I assume your doing air exchanges from the room every 2 to 3 hours since your running co2 you have to vent all that out and replace fresh air in every few hours and lights off no co2 at all just vent out and in clean air on schedule. A box of Damp rid in there can help also.

yeah we have 2 bigger fans going and one smaller 8 inch fan, night temp hanging around 68* humidity is the same. Looking to see what happens when lights come on. also we are not doing any air exchanges

Basically this is what happened, we have a decent size a/c unit that we had mounted in the back of the sealed room soon after though we realized that it would take so much humidity out of the room that it would drip water all over the floor and has caused some mold in one of the corners.

we have the sentinel EVC-2 environmental controller but when we have the a/c plugged into it, it stays on no matter when it is plugged in, even though it is programmed to only come on when temps get above 84*. It doesnt even turn off at night, i dont know if we got a bad unit or what

The sentinal controller, even though it says it controls temperature is really made for a fan. The internal relay that switches the outlet on and off probably can't handle the large inductive load presented by an airconditioner. It probably welded the contacts on the relay shut.
The water flowing over the back isn't really a malfunction. The AC should be able to displace all of the water it collects into the condensing coil. Is the AC level? If it's a window unit, often there is a plug you can remove and either put a catch bucket under it or tap a hose on to it to a drain.

to use the sentinal controller to operate anything but the smallest AC you need an external relay with a trigger cord that will plug into it.

I would use the AC and use it's internal t-stat. this is the best way to go unless you really set it up properly. the compressor in an AC also needs to have a 3 minute minimum off cycle. using the internal electronics insures that it is cycling properly.

That will allow you to control the humdity and temp during the photoperiod. when the lights are out, you can vent to the outside or set up a dehuey. Another option is to simply put a small eletric heater in there during the night that will generate enough heat to keep your AC dehumidifying. It sounds really ineffecient, but running a dehuey often does the same thing. Ads enough heat to kick on your AC!

how would we go about making a relay and trigger to plug the a/c into the controller

AdvancedNewbie said:

There's a product called damprid...

http://www.damprid.com/moisture-prevention/moisture-absorber/absorbing-excess-humidity

I know you're CO[SUB]2[/SUB]-ing but you could refresh air every now and again? I heard those damprid things drop the humidity by ~2% each day.

Click to expand...

Those suck last year I tried them out and they dont do shit maybe drop your humidity 2% like you said. I used a lot too, I hung about 3 of the Damp Rid closet hangers ( used for keeping your clothes dry and free of mold) Also used about 4 small buckets with damp rid in them and that didnt do much either.. Like BUDS said if you are running a sealed room with Co2 then you should be able to afford a decent De-humidifier. Running a sealed room isnt cheap I found that out but at least your harvests will be kick ass.

Do a search on DIY light controller. Same thing. Just use the internal t-stat in the AC, It will work better and you already have it. If the sentinal isn't turning it on and off it's likely toast. Try plugging a fan inso it and see if it still works.

Hitting 70%rh in veg isn't a problem, but you don't want t be doing that when your deep into flower. Get your temps into the range that you like and see where your RH lands, I do 78-82 and 1000ppm co2 . My RH ends up between 40-50 with the lights on and dehumidification being handled by the AC. during their night, I use an LG dehuey I got off craigslist for 50 bucks.

I am also using an LG 1.5 ton window airconditioner that I purchased on craigslist for 150.00. Going sealed doesn't always have to cost a fortune but always requires the use of the proper equipment.

If this room works out as expected, I will upgrade to a 2 ton minisplit.

i caved in a got a dehuey, night temp is 71* 52% humidity now and its only been on for half hour.

so how does around 82-85* with 55% humidity during the day sound? i think what i might do is sell our current big a/c and buy a smaller one

FilthyFletch said:

A dehumidifier is best solution make sure plenty of fans going 24/7. I assume your doing air exchanges from the room every 2 to 3 hours since your running co2 you have to vent all that out and replace fresh air in every few hours and lights off no co2 at all just vent out and in clean air on schedule. A box of Damp rid in there can help also.

Click to expand...

why would you evacuate a sealed room? defeats the purpose of sealing don't ya think?

th3godf4th3r said:

i caved in a got a dehuey, night temp is 71* 52% humidity now and its only been on for half hour.

so how does around 82-85* with 55% humidity during the day sound? i think what i might do is sell our current big a/c and buy a smaller one

Click to expand...

That's sounds nice with co2. I run my room whereever the sweet spot is for my gear. For some reason certain combinations create conditions where my equipment works against each other and I get big swings in temp and humidity. That is typically in the high 70s low 80s.

Even in a sealed room you must do air exchange. If your not pulling the old air out and bringing fresh air in and just pumping co2 your basically strangling your plants and production will suffer greatly while also inviting mold bud rot and lower production output. Exchange the air every couple hours and get a dehumidifier they are cheap.

correct me if im wrong but dont the plants make oxygen? not to mention its very hard to have a perfectly sealed room (i know mine isnt), lights etc so they should get a decent amount of oxygen regardless correct?


and im not fighting but if you read my post i said i caved in a got a dehuey