Ideas on how to lower grow room temps. HELP PLEASE

[Aqua Man]

It one of the simplest and easy way to do it , I’m always looking for as my wife calls it Farm Fix . What can I say I’m a cheap ass Irishman .....

Haha ingenuitive... Makes it sound better.

 

[Gashuffer]

I use a old cleaned nut bottle round one at that cut top n bottom off put black stocking or fine material cover both ends open up the bottom round hole at bottom of tent stick the tube in tighten up the ties around the tube have your exhaust fan running 24/7 do up the tent the exhaust fan sucks fresh cool air in through the tube you made to fit through the tent hole passive air is no archived . Regards OD .

You do this when your tent doesn't have an inlet screen? My tent has a huge rectangle screen at the bottom for inlet air. Do all tents not have this?

 

[One drop]

You do this when your tent doesn't have an inlet screen? My tent has a huge rectangle screen at the bottom for inlet air. Do all tents not have this?

No I seal up all those ones , my lights on is at night when I’m home so I make sure no light leaks in the day time , run your exhaust 24/7 works for me like a charm , cheap n easy farm fix . Regards Od .

 

[Beowuuulf]

First where is your thermometer?

Aqua always asking the important questions

 

[O.CBBS]

No I seal up all those ones , my lights on is at night when I’m home so I make sure no light leaks in the day time , run your exhaust 24/7 works for me like a charm , cheap n easy farm fix . Regards Od .

So some negative air pressure after doing this yeah?

 

[Gashuffer]

No I seal up all those ones , my lights on is at night when I’m home so I make sure no light leaks in the day time , run your exhaust 24/7 works for me like a charm , cheap n easy farm fix . Regards Od .

Ah ok got it. I've only been growing Autos, so light leak isn't a concern for me ATM. But, it sounds like your vent is more of a light filter than it is a particle filter.

 

[Gashuffer]

So some negative air pressure after doing this yeah?

It'll depend on your inlet volume and your outlet volume, if your inlet is passive of forced. If your outlet is forced with a fan and your inlet is not, you'll need a larger inlet area to account for the lack of forced air.

 

[O.CBBS]

It'll depend on your inlet volume and your outlet volume, if your inlet is passive of forced. If your outlet is forced with a fan and your inlet is not, you'll need a larger inlet area to account for the lack of forced air.

Gotcha. Yeah I’m running a 4” inline fan forcing air out. With just a vent a little more than halfway open.

 

[Gashuffer]

How large is the vent? Think it’s double the size of a 4” diameter circle?

 

[O.CBBS]

How large is the vent? Think it’s double the size of a 4” diameter circle?

Maybe double. There is a slight negative pressure.

 

[O.CBBS]

How large is the vent? Think it’s double the size of a 4” diameter circle?

The rectangle is 12”x7” that I’m using for my inlet

 

[Gashuffer]

Plenty large enough. The area of a 4” circle is around 12-13sqin. That 12x7 is 84sqin, many times over your forced outlet. I’d be surprised if you had negative pressure, assuming your inlet is at least half open.

 

[Gashuffer]

Just saw your other post about maybe slight negative pressure. You could always just open up the inlet to max to see how that goes.

 

[FourthCity]

HELP I have a 4x2 tent with a 315w cmh light 4” exhaust fan (195 cfm) and fans blowing a lot air around in the tent. With lights on tempt are up twards 87 lights off is not a problem being down to 72. The temp in the house is kept at 75. Please help I’ve run outa ideas

Gotcha. Yeah I’m running a 4” inline fan forcing air out. With just a vent a little more than halfway open.

I’ll try that out! It’s just felt hotter right where I put it so I was trying to suck that hot air directly out.
I don’t know what else to try, I’ve tried playing with the positive and negative air pressure, different fan set ups, even different rh.

Gotcha. Yeah I’m running a 4” inline fan forcing air out. With just a vent a little more than halfway open.

Is your inline fan blowing air in the tent or out? When you say its blowing a lot of air around in the tent it makes me think that you have the airflow going the wrong way. For the passive airflow that onedrop mentioned to work the inline fan needs to be sucking the air out of the tent (out the round duct/tube) which will then the passive draw of fresh air from other available vents or openings. In other words, the open end of the inline fan inside the tent should be the vacuum that pulls air in through the vents rather than a blower that pushes air out the vents. If you already have it this way then I just misunderstood your wording, carry on.

 

[O.CBBS]

Is your inline fan blowing air in the tent or out? When you say its blowing a lot of air around in the tent it makes me think that you have the airflow going the wrong way. For the passive airflow that onedrop mentioned to work the inline fan needs to be sucking the air out of the tent (out the round duct/tube) which will then the passive draw of fresh air from other available vents or openings. In other words, the open end of the inline fan inside the tent should be the vacuum that pulls air in through the vents rather than a blower that pushes air out the vents. If you already have it this way then I just misunderstood your wording, carry on.

It’s exhausting the air

 

[O.CBBS]

Just saw your other post about maybe slight negative pressure. You could always just open up the inlet to max to see how that goes.

Haha I tried this and it actually raised the temps

 

[Gashuffer]

Haha I tried this and it actually raised the temps

Strange that it would cause a higher temp. If it doesn't work, move it back!

 

[O.CBBS]

Strange that it would cause a higher temp. If it doesn't work, move it back!

Yeah where I got it I’ve gotten best results. It’s a slight negative air pressure. The plants are loving it. Also my first runs trying out organic and some new products under this 315w cmh got the Phillips bulbs, good genetics so I’m hoping for the best. Thank you everyone for all the advice and help!!!!

 

[O.CBBS]

ok so in the morning my temps are up. (the tent doesn't get opened for a long period of time) after leaving the tent be overnight my temps in the tent are up to 86 with it being in the shade in the canopy. the leaf temps are up to 80 but the drop very quickly after opening the tent. this made me thought about what gashuffer said so I opened up an extra vent. and no change. one plant is showing a little heat stress with the leaves cupping up but after opening the vents she's gone back to normal. I eel beaten hahaha is this light just to much for this room and I can't cool it down without taking extreme measures? do I need to switch to led?

 

[Aqua Man]

ok so in the morning my temps are up. (the tent doesn't get opened for a long period of time) after leaving the tent be overnight my temps in the tent are up to 86 with it being in the shade in the canopy. the leaf temps are up to 80 but the drop very quickly after opening the tent. this made me thought about what gashuffer said so I opened up an extra vent. and no change. one plant is showing a little heat stress with the leaves cupping up but after opening the vents she's gone back to normal. I eel beaten hahaha is this light just to much for this room and I can't cool it down without taking extreme measures? do I need to switch to led?

HID definitely runs much hotter. You need to increase the air exchange and/or switch to LED if temp is an issue.

What size tent and exhaust fan do you have?