Cooling issues

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NewtoDWC

Active Member
Hello growmies, I’m having trouble cooling my room when lights are on. I was using 2 a/c infinity 4in exhaust fans, One bringing air in and one out. My room was staying around 84 sometimes 85 lights on. I upgraded to 6in AC infinity. I’m still having trouble keeping it below 83. (Which doesn’t make sense due to 50% more airflow) I’m using negative pressure but I have to max out fan speed. What is my issue? Room specs: 5x5x5 insulated room in a crawl space with temps in 68-71 degrees consistently. 6in ac infinity exhaust with carbon filter, spider farmer sf4000 at 80% two ac infinity mini fans circulating air, DWC 3 weeks into flower. Any help would be appreciated, thanks.
 

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TCH

TCH

Well-Known Member
Where are you exhausting the air to? Is it leaving the room completely or recycling through the same room?
 
CaliRootz88

CaliRootz88

Well-Known Member
Increase the airflow at the canopy level with oscillating fans. Raise and or dim the light.
More PAR isn’t worth it if your environment is compromised over it. Quality not quantity.
Have you looked into a portable a/c ?
 
coreywebster

coreywebster

Well-Known Member
If its sealed everywhere but the intake and outake then the outake can only remove air as fast as the intake can replace it.

So your intake is restrictive and your weak link.

That said, 83f -85f under LED is not an issue .

The other thing you could do is make your drivers remote and have them out of the grow environment.
 
N

NewtoDWC

Active Member
CaliRootz88 said:
Increase the airflow at the canopy level with oscillating fans. Raise and or dim the light.
More PAR isn’t worth it if your environment is compromised over it. Quality not quantity.
Have you looked into a portable a/c ?
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Thanks for info, I currently have the oscillating fans at bottom blowing air under the canopy, I’ll definitely move one or both to the top. I bought a portable a/c but I don’t have the proper vents to exhaust grow room and a/c. That’s when I upgraded to 6 in fans.
 
smoke and coke

smoke and coke

Well-Known Member
Are you using a 6” fan for exhaust and a 6” fan for intake?
I run a 6” in-line fan for exhaust and a 7” passive intake with two 90 degree elbows in an S shape for light blocking coming through the intake. I only use 1 fan in a 7’x7’x7’ room.

I guess you could do 2 exhaust fans and 2 passive intakes or 1 big passive intake ( not sure on size to keep a slight negative pressure). Seems like a bit much though for air exchange though.
 
xox

xox

Well-Known Member
in take/ out take size of fan is irrelevant if the ambient temperature outside of the grow room your getting air from is too high. sounds like you need to get air conditioning or shut it down in the summer time
 
N

NewtoDWC

Active Member
xox said:
in take/ out take size of fan is irrelevant if the ambient temperature outside of the grow room your getting air from is too high. sounds like you need to get air conditioning or shut it down in the summer time
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The outside ventilation is typically in low 70’s upper 60’s. One would think that would be good enough. I’m currently using positive pressure (bringing more air in than out) and it cooled it down pretty good. 77-78. So I was able to turn up lights from 85% to 100% and still able to keep daylight temps in the 81-82 deg range. And 71-72 deg lights out. I know this isn’t “perfect” temps but the plants seem to be doing well. I’m sure they could do better but at the moment that’s the best I can do. This was my first/last summer time grow. Too stressful
 
TCH

TCH

Well-Known Member
NewtoDWC said:
The outside ventilation is typically in low 70’s upper 60’s. One would think that would be good enough. I’m currently using positive pressure (bringing more air in than out) and it cooled it down pretty good. 77-78. So I was able to turn up lights from 85% to 100% and still able to keep daylight temps in the 81-82 deg range. And 71-72 deg lights out. I know this isn’t “perfect” temps but the plants seem to be doing well. I’m sure they could do better but at the moment that’s the best I can do. This was my first/last summer time grow. Too stressful
Click to expand...
Those temps are pretty solid with led if my memory serves me correctly.
 
xox

xox

Well-Known Member
NewtoDWC said:
The outside ventilation is typically in low 70’s upper 60’s. One would think that would be good enough. I’m currently using positive pressure (bringing more air in than out) and it cooled it down pretty good. 77-78. So I was able to turn up lights from 85% to 100% and still able to keep daylight temps in the 81-82 deg range. And 71-72 deg lights out. I know this isn’t “perfect” temps but the plants seem to be doing well. I’m sure they could do better but at the moment that’s the best I can do. This was my first/last summer time grow. Too stressful
Click to expand...
you run your lights during the night when the ambient temperature outside the building is cooler right?
 
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