How do I handle the summer heat?

Clown Baby

Clown Baby

Well-Known Member
3 possible solutions:

1. Aircool your lights, draw air from a cool (relative) source.
2. Air conditioning
3. Dont grow indoors with HPS in the summer
 
georgyboy

georgyboy

Active Member
the spare room temps are down to 77 but I can't get the closet temps down. Would adding a fan to the 4" intake help bring more air in, or is the 6" on the exhaust already pulling as much air into the closet as is possible? the closet is 5x2x6.5 (65ft^3) and the fan is rated at 160 cfm.
 
Clown Baby

Clown Baby

Well-Known Member
I always make my passive intake bugger than my exhaust.

Meaning your with your 6" exhaust, you should have at least a 6" intake. Also.. how is a 6" fan only rated at 160CFM? Is it a booster fan? or an inline fan?
 
FresnoFarmer

FresnoFarmer

Well-Known Member
Clown Baby said:
I always make my passive intake bugger than my exhaust.

Meaning your with your 6" exhaust, you should have at least a 6" intake. Also.. how is a 6" fan only rated at 160CFM? Is it a booster fan? or an inline fan?
Click to expand...
I always thought you wanted more exhaust than intake in order to cause negative pressure.
 
georgyboy

georgyboy

Active Member
FresnoFarmer said:
I always thought you wanted more exhaust than intake in order to cause negative pressure.
Click to expand...
You could have a larger intake hole than your exhaust and still have negative pressure as long as your fan pulls hard enough. Technically as long as all the air is being pulled into the room and out the exhaust it's negative pressure. Positive pressure would only happen if you pushed air into your grow, or if your intake fan was stronger than your exhaust. I think.
 
georgyboy

georgyboy

Active Member
Clown Baby said:
I always make my passive intake bugger than my exhaust.

Meaning your with your 6" exhaust, you should have at least a 6" intake. Also.. how is a 6" fan only rated at 160CFM? Is it a booster fan? or an inline fan?
Click to expand...
Yeah it's a 6" booster/duct fan. It's rated at 160 free air flow and 240 booster cfm. I've been leaving the zipper open on my closet. I'm going to move up to an 8" intake. would it be better to have one 8" or two 4" intakes?
 
FresnoFarmer

FresnoFarmer

Well-Known Member
georgyboy said:
You could have a larger intake hole than your exhaust and still have negative pressure as long as your fan pulls hard enough. Technically as long as all the air is being pulled into the room and out the exhaust it's negative pressure. Positive pressure would only happen if you pushed air into your grow, or if your intake fan was stronger than your exhaust. I think.
Click to expand...
I stand corrected. I misinterpreted the post. Yes you can have a larger PASSIVE intake and still create negative pressure, but never a larger intake FAN.
 
FresnoFarmer

FresnoFarmer

Well-Known Member
georgyboy said:
Yeah it's a 6" booster/duct fan. It's rated at 160 free air flow and 240 booster cfm. I've been leaving the zipper open on my closet. I'm going to move up to an 8" intake. would it be better to have one 8" or two 4" intakes?
Click to expand...
You need a squirrel cage fan or centrifugal fan. Those booster fans are crap.
 
georgyboy

georgyboy

Active Member
FresnoFarmer said:
You need a squirrel cage fan or centrifugal fan. Those booster fans are crap.
Click to expand...
I thought 160 cfm would be good enough to cool a 250 hps and some cfls in a closet that is barely 65 cubic feet. tried saving a buck. Would a 4" inline fan pull it off. 6" inlines are rated at like 420 cfm or something like that. Even with a carbon filter slowing it down, it still seems like overkill.
 
FresnoFarmer

FresnoFarmer

Well-Known Member
Yeah, I think a 4 inch inline would work alot better than a 6" booster. Are you sucking cool are into the room??.....Out here we are in the high 90's all summer and 100-110 at the highest. That's why I only grow outdoors in the summer. way too costly to keep a grow room cool.
 
L

Luke123

Member
I used to have heat problems every summer. My solution: cool tube.

Not sure if it will work on your setup but it did for me. Its cheaper than AC, and allows you to move the light closer. I have a 600w hps and a 430cfm and I can touch the glass even after 12hours.

Just my 2 cents

bongsmilie
 
georgyboy

georgyboy

Active Member
I know cool tubes are the best way to keep temps down, but they are expensive and not practical to my setup. the air being sucked in to my grow area seems to be varying from 77-84 degrees. The answer is pretty simple, I need more cool air coming in and more hot air being sucked out. It's up to me to figure out how to do it. I might trash all my girls except the one that is almost done flowering, (1 is 7weeks flower the others have just started to really look like flowering cannabis) let her finish, and then redo the closet and wait to start my next grow until after the outdoor temps get back in the 80s. I just hate the thought of an empty garden :sad:.
 
I

interga2

Active Member
u came so far! make it work bro. where theres a will, theres a way. have poop bud is better then none!!! do what u gotta do even if it means blowing cold air out ur lungs!!
 
B

BUDies

Active Member
im having a pretty bad heating problem as well, my flower room is in the garage and in light hours it gets up to 89 and in the dark it stays at the low 80's high 70's. i'm on kinda a budget so i would rather not get an A/C unit, but how much do you guys think it would hep if i got another inline fan for exhaust because currently my inline fan runs straight through the 1000w to from one vent in the tent to another, b i could attach the exhaust ducting to a vent in the garage because i think the hot exhaust just circulating in the garage is whats making it really hot along with the dehumidifier pumping hot air into the room, but with the exhaust i could turn the dehumidifier way down and help the room cool off that way also. And the garage doesn't get very hot without the room even on hot summer days so i think if i start pumping the hot air outside the intake would only be taking in low 80 degree air max in the middle of the hottest days, so in my vision would keep the room from ever breaking 84. But i was wondering how much you guys think this will really bring down the temperature or if it will only make a couple degree temp difference, and if i will still end up needing an A/C system. any help would be appreciated, thanks.
 
fir3dragon

fir3dragon

Well-Known Member
georgyboy said:
Yeah it's a 6" booster/duct fan. It's rated at 160 free air flow and 240 booster cfm. I've been leaving the zipper open on my closet. I'm going to move up to an 8" intake. would it be better to have one 8" or two 4" intakes?
Click to expand...
thats the problem right there. you need a inline fan not a booster fan. mine is 450 cfm. i got sliding closet doors i keep them closed and have the ac on in the bedroom with the door closed temps stay 70 in the room 76 in the closet with the light on. its a 400w with a 10k btu ac.
 
fir3dragon

fir3dragon

Well-Known Member
BUDies said:
im having a pretty bad heating problem as well, my flower room is in the garage and in light hours it gets up to 89 and in the dark it stays at the low 80's high 70's. i'm on kinda a budget so i would rather not get an A/C unit, but how much do you guys think it would hep if i got another inline fan for exhaust because currently my inline fan runs straight through the 1000w to from one vent in the tent to another, b i could attach the exhaust ducting to a vent in the garage because i think the hot exhaust just circulating in the garage is whats making it really hot along with the dehumidifier pumping hot air into the room, but with the exhaust i could turn the dehumidifier way down and help the room cool off that way also. And the garage doesn't get very hot without the room even on hot summer days so i think if i start pumping the hot air outside the intake would only be taking in low 80 degree air max in the middle of the hottest days, so in my vision would keep the room from ever breaking 84. But i was wondering how much you guys think this will really bring down the temperature or if it will only make a couple degree temp difference, and if i will still end up needing an A/C system. any help would be appreciated, thanks.
Click to expand...

i read the first sentence and stopped. if the air outside the room is hot, you simply need a ac. the air around the grow needs to be cool in order for it to be cool inside the grow.

and your venting into the same room its in.. needs to be vented somewhere else.
 
fir3dragon

fir3dragon

Well-Known Member
georgyboy said:
I know cool tubes are the best way to keep temps down, but they are expensive and not practical to my setup. the air being sucked in to my grow area seems to be varying from 77-84 degrees. The answer is pretty simple, I need more cool air coming in and more hot air being sucked out. It's up to me to figure out how to do it. I might trash all my girls except the one that is almost done flowering, (1 is 7weeks flower the others have just started to really look like flowering cannabis) let her finish, and then redo the closet and wait to start my next grow until after the outdoor temps get back in the 80s. I just hate the thought of an empty garden :sad:.
Click to expand...
not sure where you live, i bought a cooltube for 70 bucks and a 10k btw ac for 50 bucks off craigslist that still basically looked brand new and works fantastically the cooltube was brand new. you would also need a 6 inch carbon fan and filter for odor and ventilation and trash that booster fan. i paid 80 a piece for my fan and filter on ebay for cheap ones until i can get better stuff
 
Cannabolic

Cannabolic

Well-Known Member
make sure your exhaust is stronger than your intake. your exhaust has to be able to force air out enough to keep it around 75 degrees. so if your room is still too hot, you need a bigger exhaust. remember air flow is key. and also having a fan helps.
 
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