Best way to keep room cool with what I have

[SPLFreak808]

Sounds like my house, I needed to move a fuck ton of air just to inch me towards ambient in an HID cab and that had a sealed hood.

Not sure if I missed it, how do you measure temps @BassheadGrowsWeed ? Out of the light yes?

 

[Budzbuddha]

Run tent open during time you are awake and ZIP when ready for bed. Place an oscillating fan
blowing into open tent while open to lower temps by moving static air. Vent as usual and this method will not push your fan setup while open since you are moving more air in while open.

Led panels get hot because of the stupid panel glass. It’s side vents throw hot air above the panel. , so NEEDS to be circulated out. So the hottest part of your tent will be the space between top of led and ceiling of tent. You can ALSO use a clip fan mounted to pole above led panel to blow air across panel......easy way move air even when zipped close .

GL

 

[BassheadGrowsWeed]

Sounds like my house, I needed to move a fuck ton of air just to inch me towards ambient in an HID cab and that had a sealed hood.

Not sure if I missed it, how do you measure temps @BassheadGrowsWeed ? Out of the light yes?

yeah I leave it in the corner behind the inlet vent

 

[Mr Lizard]

Alright so I recently added another tent to the guest room and things are getting hot.

I’ve got my clone/veg tent (2.5x2.5x5) with a mars hydro reflector 96 in it running 18/6 (6pm-12pm). Currently there is just a vent pipe out the top into the room and the two passive flaps are open.

I’ve also got a larger flower tent (3x5x7) with a lush Dominator 2xxl on 12/12 (8pm-8am). In this tent I currently have a 4” 189cfm fan (placed outside the tent) attached to a carbon filter(inside) and exhausting out the window. I’ve got 3 small oscillating fans inside to keep air moving. This tent stays roughly 10-12 degrees hotter than the ambient temp of the room. When I wake up around 7am it’s usually around 88 degrees in the tent.
As of tonight, I’ve got another 165cfm 4” fan as an intake on the bigger tent set to low in the variable speed controller. It’s coming into the tent on the opposite lower side from the exhaust.

I’ve been putting a large box fan in the window of the grow room pulling air in and a oscillating fan in the doorway blowing out of the room into the house to try and keep it cool but it’s still decently warm (ambient in room 74-76 even when it’s pulling in 65 degree ish air from outside)

Not sure if I should keep the fan as an Intake, use it to vent the veg tent (3 recently rooted clones in there currently nothing really going yet), or what I should do. We’re moving in mid October and I’ll have central air and more space so temp won’t be as much of a worry, just trying to finish out this flower without roasting everything. I tried getting the room as cold as possible (72 @8:30am) before work today and then shut the door and windows and it was back up to 78 when I got home. I’m rambling by now, just trying to give as much info into my issue as possible

We've just had solar panels put on the house. I've changed my setup to instead of running at night I run it during the day. Installed a portable aircon in the room. It'll be interesting to see how it goes on the next few days. We have two days of over 40C days coming up. For you yanks out there that's about 105+

 

[Sdh777]

I use a 6000btu portable A/C unit in my grow room & it works great. They’re not exactly cheap at $300-$400, plus they’ll run up your electricity bill, but it’s for a good cause so what the hell.

 

[Renfro]

So you have a fan blowing air in a window right? You have a way hot air can get out of the room?

 

[Sdh777]

I use my portable A/C unit that releases warm air through its rear vent duct which is then routed out of the grow room and then out a window in another room. I can attach a few pics if you want. This setup dropped the temps in my grow tent from 86°F to 76°F on average.

 

[Renfro]

The main thing for the OP to consider is they aren't too far off. I like plants under LED to be around 85F, even 87 if I have the CO2 supplemented. So we just need to get 3 degrees F lower from 88 to 85. It would be nice to have cooler temps during ripening though.

 

[Sdh777]

My biggest challenge is , living in Colorado, I’m battling a hot grow room from 4x 1000watt LED’s while trying to keep humidity levels up during veg. My Rh will drop below 20% if I’m not constantly fighting it....except during mid to late flower when the plants create excessive Rh, so then I’m working to lower it. I’m actually building a perpetual humidifier this week that auto-fills on it own. I have 3 tents and currently each humidifier has to be filled twice a day...and that shit is getting old. If they run dry my Rh drops from 50% to 20% in less than an hour.

 

[Renfro]

My biggest challenge is , living in Colorado, I’m battling a hot grow room from 4x 1000watt LED’s while trying to keep humidity levels up during veg. My Rh will drop below 20% if I’m not constantly fighting it....except during mid to late flower when the plants create excessive Rh, so then I’m working to lower it.

Same here, I use swamp coolers to humidify and then have to switch to massive dehumidification. Not letting temps drop when the lights go out is key. The plants stomata are open and they are still transpiring hard for a little bit after lights out. For me my AC unit isn't pulling any water anymore and the temps start to drop also raising the RH%. So I have to vent in some cold dry air but only a little but not too much as that makes the dehu's ineffective (can't dehu cold air). So it's a real balancing act for the first 30 minutes after lights out.

 

[Renfro]

For me the RH% battle is worst when the plants are between day 20 and day 50 of 12/12. Definitely day 30 - 50. Thats when they are at peak drink. Then they slow down and things become a little more manageable but the amount of biomass is large so it's still an issue just more manageable.

 

[Nizza]

for a passive intake you would want more than a 4" for a 4" vent fan. Is the temp in the tents and out of the tent close to eachother?
A small passive intake is a huge restriction, you can do 2-3 4" vent intakes for one 4" exhaust or a 6-8", and then for the 6" exhaust have 2-3 6" intakes or a 8" intake

You can also add a fan on the intake

 

[Renfro]

If not concerned with negative pressure then simply switching the fan from exhaust to intake might fix things.

 

[CANNABISCOOPERATIVE]

Alright so I recently added another tent to the guest room and things are getting hot.

I’ve got my clone/veg tent (2.5x2.5x5) with a mars hydro reflector 96 in it running 18/6 (6pm-12pm). Currently there is just a vent pipe out the top into the room and the two passive flaps are open.

I’ve also got a larger flower tent (3x5x7) with a lush Dominator 2xxl on 12/12 (8pm-8am). In this tent I currently have a 4” 189cfm fan (placed outside the tent) attached to a carbon filter(inside) and exhausting out the window. I’ve got 3 small oscillating fans inside to keep air moving. This tent stays roughly 10-12 degrees hotter than the ambient temp of the room. When I wake up around 7am it’s usually around 88 degrees in the tent.
As of tonight, I’ve got another 165cfm 4” fan as an intake on the bigger tent set to low in the variable speed controller. It’s coming into the tent on the opposite lower side from the exhaust.

I’ve been putting a large box fan in the window of the grow room pulling air in and a oscillating fan in the doorway blowing out of the room into the house to try and keep it cool but it’s still decently warm (ambient in room 74-76 even when it’s pulling in 65 degree ish air from outside)

Not sure if I should keep the fan as an Intake, use it to vent the veg tent (3 recently rooted clones in there currently nothing really going yet), or what I should do. We’re moving in mid October and I’ll have central air and more space so temp won’t be as much of a worry, just trying to finish out this flower without roasting everything. I tried getting the room as cold as possible (72 @8:30am) before work today and then shut the door and windows and it was back up to 78 when I got home. I’m rambling by now, just trying to give as much info into my issue as possible

My living situation means that temps can go from 2-8 c at lights out and around 38 c during lights on. Things that Ive noticed are essential for bad temp management are:

1. For cold an oil radiator outside the grow tent, in the grow room, will keep the ambient temps high enough to stop shock and keep em loving life.
2. High temps and rh can be solved by opening a window, having a large floor fan running outside the tent in the grow room and a decent intake.
3. Some say fan controllers are a big help regarding environment. never tried em myself.

 

[CANNABISCOOPERATIVE]

for a passive intake you would want more than a 4" for a 4" vent fan. Is the temp in the tents and out of the tent close to eachother?
A small passive intake is a huge restriction, you can do 2-3 4" vent intakes for one 4" exhaust or a 6-8", and then for the 6" exhaust have 2-3 6" intakes or a 8" intake

You can also add a fan on the intake

Why would you want more than 4 inches for passive? How do people even manage passive intake during lights out with light leaks etc? As for fan intake and exhaust, I have gone for a 5 inch outake and a 4 inch intake. Can remember the cms but I think the smaller one was around 20% lower.

 

[Nizza]

if you have one four inch exhaust with a fan, and a four inch intake with no fan, wouldn't you think it's restrictive?
It is hard to manage, but it could be a part of an issue . You can also waste alot of energy trying to pull air that air is restricted

furthermore if you are trying to get the best efficiency from your fans, you want an unrestricted intake (that means by rule of thumb 3x the area of your exhaust roughly, depending on CFM's) and to limit bends. It is hard to light trap in this situation but to combat heat you may want to just do a few tests on changing your ventilation technique to overcome this issue.

another way to check if your ventilation isnt the problem is simply an in-the-tent temperature and out of the tent temp.
if the two temps are very different you will know u have a venting issue

now that i've posted this and read back the temp of the room is 10 deg hotter than the tent. It is definately a tent ventilation issue and not the room its in ventilation issue.

I would tweak your venting setup man

 

[Nizza]

looking on your posts more, what I was saying about bends.. you want around 5' of straight duct ideally on either side of your inline. the fact that you have it bending 90 degrees directly from the fan will restrict that fan terribly.

Also, the exhaust looks like it goes out of the top of the tent, then directly down onto the floor then back down, then up and out the window..
heat goes up so maybe try going up with it like hanging it then at the end go out of the top section of the window to reduce bends.