Cooling my grow

coreywebster

coreywebster

Well-Known Member
Evaporative coolers add moisture to the air and raise humidity which is bad during flower.

The problem is pc fans don't really have the power to overcome the resistance of the carbon filters.
But it would get a lot more noisy if you were to add a real inline fan.

Depending on lighting you could switch up to something more efficient and use less watts to have less heat.

But if I were you and 83 degrees was the worst it got then I would just carry on as you are.
 
O

O Wise One

Member
I dont have an "intake" its a sealed locker from supercloset.

SO i have both exhausts at the top...my 4in fans in the middle blowing on the plants. House temp is around 70. when my lights are on....which is 6pm-6am, it gets to about 83 max inside the closet. I keep my house cold so it should prolly be hotter in there.
 
cogitech

cogitech

Well-Known Member
The exhaust fans are useless unless there is some way for fresh room air to get in. You should at least have a passive intake near the bottom, approximately the same size as the exhaust hole/fans. Otherwise those exhaust fans aren't moving any air at all. This is bad for heat and also bad for the plants because they need a fresh supply of CO2.
 
JAMO_Grow

JAMO_Grow

Well-Known Member
If using an HPS or MH I would recommend an air cooled hood works great.In summer I had huge heat waves that spike the temps in my grow, I couldn't afford a A/C unit so I made a really large ghetto air conditioner unit out of a cooler box with a large fan and it actually did reduce the temps significantly (5 degrees Celsius) but the ice had to be replaced regularly( I now have an actual A/C works like a charm.).I would recommend running the light on cycle at night it helps a lot to.
Hope this helps.
 
O

O Wise One

Member
cogitech said:
The exhaust fans are useless unless there is some way for fresh room air to get in. You should at least have a passive intake near the bottom, approximately the same size as the exhaust hole/fans. Otherwise those exhaust fans aren't moving any air at all. This is bad for heat and also bad for the plants because they need a fresh supply of CO2.
Click to expand...

actually I have 3 passive intakes in the back. it is passive as fuck, just holes....So i have that.

What can i do? Should i cool down the ambient in my closet even more so the locker is cooler??
 
ganga gurl420

ganga gurl420

Well-Known Member
What I do is...
I have a fan blowing In the bottom vent in my tent from the outside of it. Directly behind the fan I keep a 1 gallon frozen water jug. I have a back up frozen jug in the freezer, so they are switched out every day.
Works like a charm
 
ttystikk

ttystikk

Well-Known Member
ganga gurl420 said:
What I do is...
I have a fan blowing In the bottom vent in my tent from the outside of it. Directly behind the fan I keep a 1 gallon frozen water jug. I have a back up frozen jug in the freezer, so they are switched out every day.
Works like a charm
Click to expand...
Try just having a shallow tray of water in the bottom of your tent. Lightly blow air across it. It will provide at least as much cooling as your gallon jugs (of frozen water) and will cost much less.
 
ganga gurl420

ganga gurl420

Well-Known Member
ttystikk said:
Try just having a shallow tray of water in the bottom of your tent. Lightly blow air across it. It will provide at least as much cooling as your gallon jugs (of frozen water) and will cost much less.
Click to expand...
I thought about that ...but as warm as it gets in my tent...I didn't want to create unneeded humidity. This way it keeps the rh low and it's like sticking a mini air conditioner on my grow.
Lol and by the way ...it costs me nothing other then the power it took turn on the sink. The fan was already blowing fresh air in my tent :)
 
cogitech

cogitech

Well-Known Member
O Wise One said:
actually I have 3 passive intakes in the back. it is passive as fuck, just holes....So i have that.

What can i do? Should i cool down the ambient in my closet even more so the locker is cooler??
Click to expand...
Wait. The cabinet is inside a closed closet?

There is your problem. Heat is building up inside the closet.

So yes, get the closet temperature down a few degrees and the cabinet will then come down about the same amount if the fans are doing their job.
 
O

O Wise One

Member
ganga gurl420 said:
What I do is...
I have a fan blowing In the bottom vent in my tent from the outside of it. Directly behind the fan I keep a 1 gallon frozen water jug. I have a back up frozen jug in the freezer, so they are switched out every day.
Works like a charm
Click to expand...
you put the jug behind the fan to draw the cool air....or do you put the jug in front to blow the cool air in. I just want to make sure there is no typo here lol. ill have to try that on one of my vents.
 
O

O Wise One

Member
cogitech said:
Wait. The cabinet is inside a closed closet?

There is your problem. Heat is building up inside the closet.

So yes, get the closet temperature down a few degrees and the cabinet will then come down about the same amount if the fans are doing their job.
Click to expand...
Kinda. Im growing in a locker, that is inside my clothes closet. I do keep the door open from my closet when im home but maybe that isnt enough? Stays 70 in my place.
 
cogitech

cogitech

Well-Known Member
O Wise One said:
Kinda. Im growing in a locker, that is inside my clothes closet. I do keep the door open from my closet when im home but maybe that isnt enough? Stays 70 in my place.
Click to expand...
Leave the closet door open all the time and use some sort of fan to push air from the room into the closet. Or, if there is room, put the fan inside the closet, on top of the cabinet, pushing hot air out of the closet. Cool, fresh air will be drawn into the (open) closet due to the negative pressure you create with the fan. Temps inside the cabinet will drop accordingly.
 
cogitech

cogitech

Well-Known Member
If you really want to have the closet door closed most of the time, then you'll have to punch a hole in the closet ceiling and run a duct up into the attic, driven by an in-line duct fan (if this is an option). Or perhaps into an adjacent room? Again, the negative pressure created by the in-line duct fan blowing up into your attic (or adjacent room) will "suck" fresh air into the closet and cabinet.

Better yet, run the ducting from the output of your cabinet exhaust, through the in-line duct fan, then through the duct up into the attic. Your attic (or adjacent room) will reek like weed unless you also use a carbon filter.
 
ganga gurl420

ganga gurl420

Well-Known Member
O Wise One said:
you put the jug behind the fan to draw the cool air....or do you put the jug in front to blow the cool air in. I just want to make sure there is no typo here lol. ill have to try that on one of my vents.
Click to expand...
I put it just behind the fan as close to it as possible. Really works well.
 
O

O Wise One

Member
cogitech said:
If you really want to have the closet door closed most of the time, then you'll have to punch a hole in the closet ceiling and run a duct up into the attic, driven by an in-line duct fan (if this is an option). Or perhaps into an adjacent room? Again, the negative pressure created by the in-line duct fan blowing up into your attic (or adjacent room) will "suck" fresh air into the closet and cabinet.

Better yet, run the ducting from the output of your cabinet exhaust, through the in-line duct fan, then through the duct up into the attic. Your attic (or adjacent room) will reek like weed unless you also use a carbon filter.
Click to expand...
Cant. i live in an apt, hence the locker in the first place. I have a friend that has an inline vent fan, but the way the box is i cant use it how you are saying. But i think i can use that to draw regular and the water jug cold air into the locker.

So ill install that on the bottom hole, have it draw air in and cold water jug air. I have 2 fans inside to circulate, and 2 carbon filters hooked to little fans too. I think that should work???

I just want to drop it 5-7 degrees on the inside. 75 degrees or a tad cooler should be fine for flower. 50-65% RH. Higher RH when lights are off.
 
cogitech

cogitech

Well-Known Member
O Wise One said:
Cant. i live in an apt, hence the locker in the first place. I have a friend that has an inline vent fan, but the way the box is i cant use it how you are saying. But i think i can use that to draw regular and the water jug cold air into the locker.

So ill install that on the bottom hole, have it draw air in and cold water jug air. I have 2 fans inside to circulate, and 2 carbon filters hooked to little fans too. I think that should work???

I just want to drop it 5-7 degrees on the inside. 75 degrees or a tad cooler should be fine for flower. 50-65% RH. Higher RH when lights are off.
Click to expand...
Give it a shot!
 
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