Tent heat problems!! need help

greenthumb831

greenthumb831

Active Member
Hey fellas,

i have a 2x2x5 grow tent w/ a 250 watt hps light n the temperature around 85 degrees.
i have a 4in can fan HO for exhaust connected to a 200 cfm phresh filter. im useing a 4in squirrel cage blower for intake. how do i lower the temperature:confused:

THANKS!!
 
W

wbd

Well-Known Member
I have the exact same setup, pretty much.

1) Where inside the tent is your thermometer located when it says 85F?
2) What are the temps outside the tent near the intake?
 
greenthumb831

greenthumb831

Active Member
wbd said:
I have the exact same setup, pretty much.

1) Where inside the tent is your thermometer located when it says 85F?
2) What are the temps outside the tent near the intake?
Click to expand...
hi wbd,

The thermometer is at the canopy, on top of the screen for my scrog grow.
The temperature outside near intake duct is around 88 degrees
 
W

wbd

Well-Known Member
Measuring temperature at the canopy, which I realize is what everyone recommends for whatever reason, is inaccurate. Your thermometer is being affected by the radiant temps from the hot-ass lamp, which is useful to know about but grow guides citing max 85F are talking about ambient air temps and not radiant. Take you temps from inside the shade for a more accurate reading of air temperature.

That aside, there is no air conditioner in your tent so you can't take warm air and cool it. Your intake temps are too high. The solution to your heating issue will be to lower your intake temperature, either by cooling it or taking the intake from a cooler source via some ducting.
 
W

wbd

Well-Known Member
greenthumb831 said:
the light is about 13 inches away from canopy
Click to expand...
OK, well at that distance your temp reading is still being affected by radiant heat from the bulb.

But that's not really of much help to you here, you need to fix your intake temps and the tent temperatures will follow.
 
greenthumb831

greenthumb831

Active Member
wbd said:
Measuring temperature at the canopy, which I realize is what everyone recommends for whatever reason, is inaccurate. Your thermometer is being affected by the radiant temps from the hot-ass lamp, which is useful to know about but grow guides citing max 85F are talking about ambient air temps and not radiant. Take you temps from inside the shade for a more accurate reading of air temperature.

That aside, there is no air conditioner in your tent so you can't take warm air and cool it. Your intake temps are too high. The solution to your heating issue will be to lower your intake temperature, either by cooling it or taking the intake from a cooler source via some ducting.
Click to expand...
My setup is in my closet so I dont really have access to cooler air, unless I run 15 feet of ducting to my window =/
 
pattykakes

pattykakes

Active Member
my temps are at 85 with lights on and 80 with light soff and my plants are doing great... as long as your water temps are around 65-70 you're fine...
 
greenthumb831

greenthumb831

Active Member
pattykakes said:
my temps are at 85 with lights on and 80 with light soff and my plants are doing great... as long as your water temps are around 65-70 you're fine...
Click to expand...
i was thinking of using co2 foliage spray, ive read that co2 helps plants withstand 85 degree temperature
 
W

wbd

Well-Known Member
Water temps? OK.

Anyways, greenthumbs831, if you want to lower your tent temperature you have to either cool the air inside the closet/tent or bring the cooler air in from somewhere else. Speaking of lowering the temps in your closet, where is your tent exhausting to? If inside the closet, then one way to lower the closet (intake) temp is to exhaust outside of the closet.
 
greenthumb831

greenthumb831

Active Member
wbd said:
Water temps? OK.

Anyways, greenthumbs831, if you want to lower your tent temperature you have to either cool the air inside the closet/tent or bring the cooler air in from somewhere else. Speaking of lowering the temps in your closet, where is your tent exhausting to? If inside the closet, then one way to lower the closet (intake) temp is to exhaust outside of the closet.
Click to expand...
exhausted air is being blown out of the closet at the top of tent.. the intake air is being sucked through at the bottom outside of the closet
 
W

wbd

Well-Known Member
Well, guess you need to figure out how to get that intake cooler then.

Or, tough it out. Your temps are high but they are detrimental, like poster said earlier you can still be successful where you're at now.
 
pattykakes

pattykakes

Active Member
another thing if your water temps are too high ad 1part hydrogen peroxide to 10 parts water... the higher the temps the lower the oxygen in your water... but I've never heard of using more co2 if the temps are higher, I wouldn't think that would help any cause you don't want your co2 levels too high.
 
Oldreefer

Oldreefer

Well-Known Member
I'm lucky enough to have a floor register close to my tent so I can duct some of the ac into my tent...works like a charm...my 4" squirrel cage pulls most of the 'makeup' air from my crawl space and I run my lights only at night...
 
Victus

Victus

Active Member
get some dry ice and put it as close to the intake vent as possible. you get CO2 and lower temps. since your egress just vents to the closet, it's warming the air at the ingress as well. It's not a permanent solution but it should help til you find something for your setup.
 
TechnoMage

TechnoMage

Well-Known Member
Is your hood air cooled? All your heat is coming from your light so an air cooled hood makes a huge difference. I have a similar setup and can keep a 400w going.
 
greenthumb831

greenthumb831

Active Member
TechnoMage said:
Is your hood air cooled? All your heat is coming from your light so an air cooled hood makes a huge difference. I have a similar setup and can keep a 400w going.
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nah mann just got the econ bat wing hood.. cant afford the cooltube. =/
plus i feel that the 4in can fan will lose alot more cfm. I barely feel any suction through the carbon filter.
 
greenthumb831

greenthumb831

Active Member
Victus said:
get some dry ice and put it as close to the intake vent as possible. you get CO2 and lower temps. since your egress just vents to the closet, it's warming the air at the ingress as well. It's not a permanent solution but it should help til you find something for your setup.
Click to expand...
next time the ice cream cart guys come by ill try and buy some off them ha thanks.
 
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