4k Sealed Room - Humidity Issue

Hi I am currently struggling from high night humidity in my 4k DE sealed grow room need some advice into further honing in my new room.

I am little over 2 weeks into flower My room during the day stays a perfect 45%-51% humidity with the 2-ton mini split running. The problem is during night it spikes up (obviously) to around 70% this is what my humidity gauge tells me (only tells me high and low for the night), it might just spike up and then come down after a few minutes I am not 100% I have a strict policy about entering my room during dark hours.

Equipment: I recently was running a piece of shit 100pint Ideal Air Dehum but just shelled out the $2000 for the Quest 105 Dehum and have it hung overhead now and running at full power. Everything is set up correctly but need advice to lower humidity during night even more. Could it be that I just need to invest in a humidity controller?


Thanks in advance!


Some Pics (some humidity damage from old dehum in 2nd pic):

SeasideTrees said:

Hi I am currently struggling from high night humidity in my 4k DE sealed grow room need some advice into further honing in my new room.

I am little over 2 weeks into flower My room during the day stays a perfect 45%-51% humidity with the 2-ton mini split running. The problem is during night it spikes up (obviously) to around 70% this is what my humidity gauge tells me (only tells me high and low for the night), it might just spike up and then come down after a few minutes I am not 100% I have a strict policy about entering my room during dark hours.

Equipment: I recently was running a piece of shit 100pint Ideal Air Dehum but just shelled out the $2000 for the Quest 105 Dehum and have it hung overhead now and running at full power. Everything is set up correctly but need advice to lower humidity during night even more. Could it be that I just need to invest in a humidity controller?


Thanks in advance!


Some Pics (some humidity damage from old dehum in 2nd pic):

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You need to run both the dehumidifiers when the lights are out. I have 9 lighter and I have to run a 90 pint 70 pint and 100'pint all when lights are off. When lights are on the mini splits can handle it . Set your timers for 10mins before kicks kick off to give the dehu time to warm up . The spikes in humidity will fuck you . Also get a 2 foot led fixture and hang it on your roof. Put a green bulb in there so you can go in once a week during lights off and kick on the green bulb and make sure everything looks good.

Also curious what your temps are with a 2 ton and 4k worth of Double ended ?

patrickkawi37 said:

Also curious what your temps are with a 2 ton and 4k worth of Double ended ?

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Thanks for the reply! My temps never budge during the day. I keep it 81 degrees since I'm running CO2, every day its the same temp. I can get it down to 71 daytime constantly if I really wanted to but my AC would become a horse.

SeasideTrees said:

Thanks for the reply! My temps never budge during the day. I keep it 81 degrees since I'm running CO2, every day its the same temp. I can get it down to 71 daytime constantly if I really wanted to but my AC would become a horse.

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81 is toasty even with co2. Get a temp gun in there. The DE setups are notorious for hot spots . I suggest dropping it to 78. 76 if you growing og. Put a timer on the backup dehu so it kicks on before lights kick off and solve that humidity issue.

patrickkawi37 said:

81 is toasty even with co2. Get a temp gun in there. The DE setups are notorious for hot spots . I suggest dropping it to 78. 76 if you growing og. Put a timer on the backup dehu so it kicks on before lights kick off and solve that humidity issue.

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Thank you, will be doing that! Great idea for the timer save me some electricity cost. Also I will dial in the temp more.

Curious how you like that Dehume. I was looking at that also. I contacted Monster Gardens about a remote humidistat control, but they never got back with me.

Rrog said:

Curious how you like that Dehume. I was looking at that also. I contacted Monster Gardens about a remote humidistat control, but they never got back with me.

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Not trying to thread jack but I highly recommend the dri eaz brand dehus. Better output . Less money

Temps in the low 80s for most of your bloom run won't hurt your plants or your yield. Bring it down into the seventies for the last week or ten days.

To improve dehuey performance, add some heat at night. You want your day and night temps to be less than twenty degrees f apart.

ttystikk said:

Temps in the low 80s for most of your bloom run won't hurt your plants or your yield. Bring it down into the seventies for the last week or ten days.

To improve dehuey performance, add some heat at night. You want your day and night temps to be less than twenty degrees f apart.

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80 degrees depending on the strain can be harmful. Specially with double ended setups because of hotspots. If he has the Ac to bring it to 77/78, it would be unwise not to do so. Night time temp better if its 10-12 degree fluctuation . 20 is too much

patrickkawi37 said:

80 degrees depending on the strain can be harmful. Specially with double ended setups because of hotspots. If he has the Ac to bring it to 77/78, it would be unwise not to do so. Night time temp better if its 10-12 degree fluctuation . 20 is too much

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The legend on the bottom right is in degrees C. It clearly shows a substantial increase in production when temperatures rise from the upper seventies to the mid 80s f.

ttystikk said:

View attachment 3426966
The legend on the bottom right is in degrees C. It clearly shows a substantial increase in production when temperatures rise from the upper seventies to the mid 80s f.

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Look dude. You can hang onto your bs. I've been growing long enough to know it is definitely strain dependent. I have OGs that show sign of heat stress even at 78. Op is using double ended bulbs. I have 15 wall fans in my room and still find spots where it is 1-3 degrees higher in some parts of the room . Though air is moving, the hot spots keep that area warm. Those 1-3 degrees when running 80-82 can fuck you with... Hairy nugs, heat stressed colas, light burn , hermis, and many more issues. Do you think this is worth it? Not if you have an ac that can kick it down a couple more degrees .

patrickkawi37 said:

Look dude. You can hang onto your bs. I've been growing long enough to know it is definitely strain dependent. I have OGs that show sign of heat stress even at 78. Op is using double ended bulbs. I have 15 wall fans in my room and still find spots where it is 1-3 degrees higher in some parts of the room . Though air is moving, the hot spots keep that area warm. Those 1-3 degrees when running 80-82 can fuck you with... Hairy nugs, heat stressed colas, light burn , hermis, and many more issues. Do you think this is worth it? Not if you have an ac that can kick it down a couple more degrees .

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As you go to some pains to point out, that's a heat management problem with the equipment- in short, a flaw- and not the theory.

ttystikk said:

As you go to some pains to point out, that's a heat management problem with the equipment- in short, a flaw- and not the theory.

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Keep your wisdom. It makes me sick how much misleading information is thrown around riu now. Seems like icmag is where the real growers have gone. Show me where you get over 2 per light with OGs ... And have temps in the 80s... And still have top quality flawless nug. And I will apologize . Otherwise, shut the fuck up.

Whats your night time temperature? The colder the room is when the lights are off, the harder it is to control the humidity. In my 8k DE room I keep the night time around 74 and two kenmore 70 pints keep up just fine

patrickkawi37 said:

Keep your wisdom. It makes me sick how much misleading information is thrown around riu now. Seems like icmag is where the real growers have gone. Show me where you get over 2 per light with OGs ... And have temps in the 80s... And still have top quality flawless nug. And I will apologize . Otherwise, shut the fuck up.

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Then by all means, take your attitude problem there.

ttystikk said:

Then by all means, take your attitude problem there.

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Some people depend on growing, for there next meal in one way or other. So when someone gives information that is inaccurate , and then debates me about it. Yes I get pissed. he said he can drop it a couple degrees, why wouldn't you? if your grow room is in the 80s, your nugs are going to look flawed... at which point the dispensaries will not take it for top donation in my neck of the woods.. and you are not making any money to put food on the table.

patrickkawi37 said:

Not trying to thread jack but I highly recommend the dri eaz brand dehus. Better output . Less money

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http://www.drieaz.com/_DEC/DEC_Product_Base.aspx?decID=2120 I see this can be ducted on the return. Not set up for supply side ducting it seems. Good looking unit, though.

Same price as the other at about $2k?

Rrog said:

http://www.drieaz.com/_DEC/DEC_Product_Base.aspx?decID=2120 I see this can be ducted on the return. Not set up for supply side ducting it seems. Good looking unit, though.

Same price as the other at about $2k?

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My bad I thought it did more pints per day than then. It surely kicks ass. I thought the price was lower honestly too because I buy them used... I find a lot of carpet cleaning businesses and shit like that that will buy dri eaz units.. And they get too many or have one sitting with only 2000 hours and I will pick it up for 4-600 bucks . The amperage is very low too on these

Rrog said:

Curious how you like that Dehume. I was looking at that also. I contacted Monster Gardens about a remote humidistat control, but they never got back with me.

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I really like the dehum, sure there might be one a tad bit cheaper thats comparable but I bought mine for the great warranty as well as the energy efficiency compared to any others. Electricity is $0.40/KWH for me so efficiency is a huge deal for me.