Air conditioner and humidity

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trambles

Well-Known Member
So for whatever reason my humidity it around 70% in my growroom. Usually its 55%. I think its cuz my plants are huge.
I'm running 36 6 foot tall plants under 12 gavita led lights.
Cooling I have a 3 ton mini split and a quest 165ppd dehu. For backup I have a 70 ppd dehu from home depot.
With all these running I still cant control the humidity.
Does anyone know how much moisture in PPD a 3 ton a/c will remove?
These plants are drinking around 40-50 gallons a day of water.
I need some help before I grow 40lbs of mold
 
hotrodharley

hotrodharley

Well-Known Member
trambles said:
So for whatever reason my humidity it around 70% in my growroom. Usually its 55%. I think its cuz my plants are huge.
I'm running 36 6 foot tall plants under 12 gavita led lights.
Cooling I have a 3 ton mini split and a quest 165ppd dehu. For backup I have a 70 ppd dehu from home depot.
With all these running I still cant control the humidity.
Does anyone know how much moisture in PPD a 3 ton a/c will remove?
These plants are drinking around 40-50 gallons a day of water.
I need some help before I grow 40lbs of mold
Click to expand...
Where do you think all the water you are giving is going to go? Into the atmosphere. Get some real dehumidifiers going.
 
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trambles

Well-Known Member
I have a quest dual overhead that was 2300 bucks, I think that qualifies as "real"
But yeah, I'm shopping for another one.
U did nothing to address my question btw
 
hotrodharley

hotrodharley

Well-Known Member
trambles said:
I have a quest dual overhead that was 2300 bucks, I think that qualifies as "real"
But yeah, I'm shopping for another one.
U did nothing to address my question btw
Click to expand...
Well, smart boy, it’s obviously not enough now is it? Another dumbass on RIU. Be sure to rely on AC when the dehumidifier isn’t cutting it. Try reading about grow room ventilation
 
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trambles

Well-Known Member
Dude, my setup has worked great for 5+ years, unfortunatley my schedule got off due to some unforeseen circumstances and my plants got huge.
I'm aware of your point. I'm just asking a question about what the capacity is off an air comditioner so I can properly size which dehu I purchase.
 
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Apalchen

Well-Known Member
hotrodharley said:
Well, smart boy, it’s obviously not enough now is it? Another dumbass on RIU. Be sure to rely on AC when the dehumidifier isn’t cutting it. Try reading about grow room ventilation
Click to expand...
Bad mood today? Jesus if your just gonna be a dick why even comment.
To the OP here is a list of things you can do if you don’t buy another dehuey.
1. remove plant mass,branches that aren’t gonna do anything and leafs crowding out other stuff. Will help with air flow and cut back on transpiration.
2. If you have sunrise sun set feature for your lights use it, helps combat the spike at lights off.
3. If your AC is programmable from WiFi set a schedule to start lowering the temps slowly at the end of cycle to help avoid the spike. Also if it’s programmable you can switch it to dry mode for lights off.
4. Raise your lights off temperature warm
Air can hold more water than cold air.

when figuring for dehumidifier needs you will need to have capacity to remove 90% of the water going into the room. 90% of 50 gallons is 360 pints.

Don’t be afraid to take scissors to them, cut off anything you can tell will be larf.
 
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Apalchen

Well-Known Member
trambles said:
Dude, my setup has worked great for 5+ years, unfortunatley my schedule got off due to some unforeseen circumstances and my plants got huge.
I'm aware of your point. I'm just asking a question about what the capacity is off an air comditioner so I can properly size which dehu I purchase.
Click to expand...
The problem with relying on AC is that lights off humidity is usually way higher and temps are lower so the ac isn’t really doing much when you need it. For instance I run a 3 ton as well and 3x70 pint units for a total of 210 ppd . I water 32 gallons a day so that’s 256 pints. 90% or that is 230 pints per day. I struggle to keep my humidity in range at times because I only have the 210 pints of dehuey.
 
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trambles

Well-Known Member
Apalchen said:
Bad mood today? Jesus if your just gonna be a dick why even comment.
To the OP here is a list of things you can do if you don’t buy another dehuey.
1. remove plant mass,branches that aren’t gonna do anything and leafs crowding out other stuff. Will help with air flow and cut back on transpiration.
2. If you have sunrise sun set feature for your lights use it, helps combat the spike at lights off.
3. If your AC is programmable from WiFi set a schedule to start lowering the temps slowly at the end of cycle to help avoid the spike. Also if it’s programmable you can switch it to dry mode for lights off.
4. Raise your lights off temperature warm
Air can hold more water than cold air.

when figuring for dehumidifier needs you will need to have capacity to remove 90% of the water going into the room. 90% of 50 gallons is 360 pints.

Don’t be afraid to take scissors to them, cut off anything you can tell will be larf.
Click to expand...
 
T

trambles

Well-Known Member
Apalchen said:
Bad mood today? Jesus if your just gonna be a dick why even comment.
To the OP here is a list of things you can do if you don’t buy another dehuey.
1. remove plant mass,branches that aren’t gonna do anything and leafs crowding out other stuff. Will help with air flow and cut back on transpiration.
2. If you have sunrise sun set feature for your lights use it, helps combat the spike at lights off.
3. If your AC is programmable from WiFi set a schedule to start lowering the temps slowly at the end of cycle to help avoid the spike. Also if it’s programmable you can switch it to dry mode for lights off.
4. Raise your lights off temperature warm
Air can hold more water than cold air.

when figuring for dehumidifier needs you will need to have capacity to remove 90% of the water going into the room. 90% of 50 gallons is 360 pints.

Don’t be afraid to take scissors to them, cut off anything you can tell will be larf.
Click to expand...
Thank you! This was the answer I was looking for. I'm looking at getting another dehu, probably in the 190ppd range. One thing to consider is that most dehu that advertise a ppd...say 70ppd, is saturation pod at 90% humidity and it generally removes half of that amount at 60% humidity.
I was like u running 3x70ppd dehu. I realized I was consuming 20 amps and 1900 watts so I switched to the quest 165 which only pulls 3.5 amps at 240v and around 1100 watts I think. I was at the limit of my amp limits so I had to switch everything to 240v.
Thanks again for your SENSIBLE answer!
 
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trambles

Well-Known Member
On Monday I'm gonna go through with the pruners and thin everything out, hopefuly that will reduce the levels before I drop big money on another dehu, I'm regarding that as my last option
 
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Apalchen

Well-Known Member
trambles said:
On Monday I'm gonna go through with the pruners and thin everything out, hopefuly that will reduce the levels before I drop big money on another dehu, I'm regarding that as my last option
Click to expand...
If you been running that room for 5 years with no issues, and don’t plan on regularly having the extra plant mass you did this round, I’d hook up some of the old 70 pints to finish the run, or buy one from wal mart and take it back if you need too. If you have the amps to do it.
And yeah I’m slowly getting the more expensive equipment. I went out on a limb and quit my job and moved to a legal state and spent everything I had on this house and building, and building out the building. It’s nice to be legal but this year has been a struggle as my build out budget didt go near as far as I thought it would. I have just been adding equipment as I can from each run.
So I plan on buying a quest 225 for both rooms but in the mean time i got like 3x70 pint units in each room.

residential units used to be rated at like 80 degrees and 60 percent humidity, they recently changed to lower temps which is why you see the old 70 pints are now called 50 pints. The ones you see at total saturation are usually for moisture removal companies that clean up water/flood damage.
 
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