HELP! Temps running high (mid-high 90s)...

[banjobrain]

First time grower here...

Temps in my cab are running high...currently 96 or so. I am running a 250w HPS lamp vented directly into the attic.

Can't find any problems with my ventilation.

This seems to have come up within the last week or so.

• What can I expect running temps this high another 25-30 days of flower?

Please advise, any assistance is appreciated!

 

[AOD2012]

Definitely not gonna be good for the ladies, especially in flower. I guess you checked all your ventilation and what not, but have the outside temps in your area gone up? Mine have gone from the mod 60s to 80 I'm three days and the ac is working extra hard now.

 

[AcroPhobic]

What is the ambient room temp that your INTAKE comes from at?
Check again, something is wrong here! Either your ventilation isnt good enough or your ambient room temps are too high, turn on ac if need be.

Whats your intake and exhaust? Give details.

96 will make buds airy and produce alot of foxtails not to mention something called stress! that is if the heat doesnt FRY them up 1st!

 

[AcroPhobic]

Mine have gone from the mod 60s to 80 I'm three days and the ac is working extra hard now.

Same here, my ac is chugga luggin! Went from 60 to high 80's, low 90's out of nowhere and its only MAY! insane.

 

[bosshoggin]

yeah i agree -has to be your out side temps-prob. inside as well.u have an oscilating fan of some sort? i stay in texas and our humidty is kikin myass.have to have ac on so wrkin longer........your outside temps could easily fluct2uate your inside by 10 degrees

 

[intotheunknown]

what is the CFM rating on your fan?
what size is your hood's ducting?
also if you increase the size of ducting on the exhaust side out, that will also help.
what i have done before also is take a box fan and cool the intake's air before it is pulled into the cab.
but without knowing what equipment youre using and indoor ambient temps are, its hard to give you a good answer to your question...

 

[st0ne]

Without c02, your plants stomata will close at approx 85 degrees. Without respiration, the intense light and heat will fry them from the inside out.

 

[AOD2012]

yea acro its crazy, in my area, its been pouring one day, 7o degrees the next, rain for another three, windy nasty, then 80 degrees, totally insane.

 

[banjobrain]

Thanks ya'll for getting the gears grinding!

Thanks ya'll for getting the gears grinding!

Definitely not gonna be good for the ladies, especially in flower. I guess you checked all your ventilation and what not, but have the outside temps in your area gone up? Mine have gone from the mod 60s to 80 I'm three days and the ac is working extra hard now.

Ok, good. Now that I have recognized I have a problem...let's look at this. Yes, outside temps have gone up but still haven't hit the 80s. However, ambient temps in the room where the cab is located have gone up about 15 degrees, which has probably led to the increased temps INSIDE the cab.

What is the ambient room temp that your INTAKE comes from at?
Check again, something is wrong here! Either your ventilation isnt good enough or your ambient room temps are too high, turn on ac if need be.

Whats your intake and exhaust? Give details.

96 will make buds airy and produce alot of foxtails not to mention something called stress! that is if the heat doesnt FRY them up 1st!

This is good stuff to know. Like I mentioned above, although the rest of my apartment was quite comfortable...the overall temps had raised - raising the ambient temp in the room. In addition, the ventilation is not insulated, which raises the temps even more!

The plants are stressed but they are doing ok. They'll recuperate, I'm sure. I've been able to get them back on track thus far.

Regarding exhaust, it is vented up into the attic and the air is pushed through a carbon scrubber.

yeah i agree -has to be your out side temps-prob. inside as well.u have an oscilating fan of some sort? i stay in texas and our humidty is kikin myass.have to have ac on so wrkin longer........your outside temps could easily fluct2uate your inside by 10 degrees

I have 4 small fans blowing directly on my girls and another small fan on the bottom blowing "up". The new fan on the bottom is kind of a new addition so perhaps that was aiding in the intake of the warmer ambient air!

what is the CFM rating on your fan?
what size is your hood's ducting?
also if you increase the size of ducting on the exhaust side out, that will also help.
what i have done before also is take a box fan and cool the intake's air before it is pulled into the cab.
but without knowing what equipment youre using and indoor ambient temps are, its hard to give you a good answer to your question...

FAN - Squirrel Cage 256cfm
HOOD - Sun System 4"
Exhaust - Pushed through 4" ventilation up through large scrubber



I kicked the AC on to MAX yesterday. Things improved quickly.

Currently, while plants are sleeping, ambient temps are 71, while cab temps are 76.

I have a couple of ideas...

• Add another AC unit (window box fan)
• Adjust lighting schedule

AC unit would simply cool my apartment even more

The adjustment of the lighting schedule would allow me to keep the door to the laundry room open (where the cab is located). This way, cooler ambient air would circulate in the room, cooling the temps further.

Thoughts?

 

[banjobrain]

 

[banjobrain]

Well, after kicking on the AC, the temps have dropped.

After ~3 hours of light today, the temps inside the cab are back down to ~80 degrees. Ambient temps in the grow room (laundry room) are ~73 degrees. Throughout the rest of my apartment, the temps are ~67 degrees.

Next weekend, I will be obtaining a window box AC unit. I am considering adjusting my light schedule from 1:00pm - 1:00am to be on from 5:30am - 5:30pm.

By keeping the light schedule during these hours, I will be able to really crank the AC during the times that I am away from home, lowering the temps even further.

Probably not too good for the electric bill, but it'll only be for another month or less...

 

[Justin_Credible]

I do not see any mention of co2 in here? if you are hurting from high temps then quick fix is to run out to a vending store and tell them you need a 50 size cyl of co2 for your keg/tap system. Get a reg and run her till dry. I say with temps that high set yur reg at 3.0,(2500-3000 ppm)for you should be fine.. or even a bit higher...of course never above 5...or for that matter even 4.5. CO2 Should help out a lot...might even save ya. Good luck with it.

 

[banjobrain]

Shit. I'm back. After running lights for ~5 hours I am back at 90 degrees.

God damn it! WTF?????

 

[messn'n'gommin']

Don't mean to insult your intelligence man and I know it's a stupid question, but are you running your dryer?

 

[banjobrain]

Don't mean to insult your intelligence man and I know it's a stupid question, but are you running your dryer?

No worries, I'm questioning my own intelligence, too!

I don't have a dryer (or washer) in the room.

Up until a few weeks ago, temps weren't a problem...so it must be the ambient temperature.

So, I'm wondering if the window box unit will cool down my apartment enough to keep things under control until harvest.

Perhaps I'll keep the HID grows for the winter and look into utilizing CFLs during the warmer months...

 

[PermaBuzz]

can you put the window a/c in the laundry room?

 

[banjobrain]

can you put the window a/c in the laundry room?

No window in the laundry room...

 

[Maj.Cottonmouth]

If you can build a box the link below could be an option, put the ac box in the attic and duct the cool air to your grow room.

http://www.icmag.com/ic/showthread.php?t=57828

 

[eastbaybeast]

Explain your ventilation system more.

You say you have a 256CFM squirrel fan sucking air from the hood --> carbon filter --> attic. What CFM is the carbon filter rated at?

Check your ducting and your carbon pre-filter for clogs.

I am sure you have tried all these things, but it might be an obvious solution.

Last, but not least, rip a huge bowl and blow the thick smoke through your system as a kind of DIY duct smoke test lol. I found a leak in my system that way one time LOL.

Peace

 

[intotheunknown]

Explain your ventilation system more.

You say you have a 256CFM squirrel fan sucking air from the hood --> carbon filter --> attic. What CFM is the carbon filter rated at?

Check your ducting and your carbon pre-filter for clogs.

I am sure you have tried all these things, but it might be an obvious solution.

Last, but not least, rip a huge bowl and blow the thick smoke through your system as a kind of DIY duct smoke test lol. I found a leak in my system that way one time LOL.

Peace

lol indeed that is a great way to test things.
but to be honest i would ditch the squirrel cage fan and go with an inline fan, with a larger cfm rating, and speed controller. that seems to be a big part of your problem to me.
think of it this way. your light is your heat source which is mainly causing your high temps in such a small space like a cab, so get that light COOLER. eliminate the heat at its source.

spending money on an a/c unit might just be a slight overkill, not to mention the kind of power they draw. you could spend the same amount on a bigger fan, and draw FAR LESS power, while at the same time getting that light cool enough for comfort.