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what's the hottest a room can run at?

C

CelebrityKush

Member
my ac unit for my room just broke and now my temps are running alot higher. about 85f near the tops of the plants and about 82f in the rest of the room. I'm going to have to add another light soon, and i'm sure the temp will go up some more. I am not using co2 and i am growing in soil. my night temps are almost the same...the might be 1-2 degrees cooler, but not much.

what is the hottest a flowering room can run at effectively....without slowing growth or causing other problems???

i know the books say don't go over 85f, but i just wanted to know what other people are actually experiencing. :rasta:
 
Blimey

Blimey

Take A Deep Breath
Veteran
Some strains are better at handling heat than others, but as a rule of thumb:

70's = ideal
80's = growth slowed slightly
90's = growth slowed severely
100's = death sentence

Personally, I have grown in the 90's, when I upgraded from 600W HPS to 1K HPS, but my yield ended up being less because of the heat. I had low 80s with the 600 watter. I switched back after one run. The plants didn't look sick in the 90s, they just didn't grow much.

I wouldn't advise adding another HID with a temp of 85. Try adding more ventilation, if you can. Or at least more in-room air movement. But better to get more hot air out of the room than to just move the hot air about.
Keep running the fans w/lights out if you aren't already. You want the night time temps to be at least 5 degrees cooler than daytime, if not more.

I never got my temps down below 80, so I couldn't say how much difference there is between 75 and 85, but I really noticed a big slowdown between 85 and 95.
 
Endo

Endo

IcMag Resident Comic Relief
Veteran
im running like 88 right now.. and things are a little slow... its just too damn hot here. and ac is just not an option.. just keep airflow the best you can.... and monitor water well.. they will dry out quick
 
P

Pompey_Monkey

Member
Blimey said:
Some strains are better at handling heat than others, but as a rule of thumb:

70's = ideal
80's = growth slowed slightly
90's = growth slowed severely
100's = death sentence

Personally, I have grown in the 90's, when I upgraded from 600W HPS to 1K HPS, but my yield ended up being less because of the heat. I had low 80s with the 600 watter. I switched back after one run. The plants didn't look sick in the 90s, they just didn't grow much.

I wouldn't advise adding another HID with a temp of 85. Try adding more ventilation, if you can. Or at least more in-room air movement. But better to get more hot air out of the room than to just move the hot air about.
Keep running the fans w/lights out if you aren't already. You want the night time temps to be at least 5 degrees cooler than daytime, if not more.

I never got my temps down below 80, so I couldn't say how much difference there is between 75 and 85, but I really noticed a big slowdown between 85 and 95.
Click to expand...


Blimye, Blimey!

You're using a "rule of thumb". But there are always exceptions:

Below are some pictures of my last Satori grow under a 400W hps - in temps usually between 80 and 90 (summer attic grow!). I think the airflow can compensate a lot for temps. I have a stupid capacity squirrel fan in my room. It might get hot by the thermometer, but there's soooo much fresh, C02 laden, air coming through....blah blah.... :)









I'm so confident that the current level of airflow maintains sensible temperatures that I've just upgraded to a 600W Sunmaster dual-spectrum.

So far, soo good. :)
 
S

Skrappie

Member
Pompey_Monkey said:
Blimye, Blimey!

You're using a "rule of thumb". But there are always exceptions:

Below are some pictures of my last Satori grow under a 400W hps - in temps usually between 80 and 90 (summer attic grow!). I think the airflow can compensate a lot for temps. I have a stupid capacity squirrel fan in my room. It might get hot by the thermometer, but there's soooo much fresh, C02 laden, air coming through....blah blah.... :)
Click to expand...

I don't think anyone is saying the plants wont grow even in high 90 degree temperatures, though I think more specifically the original poster wanted to know what temperatures they could grow in without slowing growth or causing problems. Your plants look nice, though i would not say they are they have lead an issue less life. (i mean no negativity when I say this, as they really do look great,) and i couldn't say they grew to their potential.



CelebrityKush: I think I notice a slump (though they still grow fine, and develop just well) when things get a little past 85. They continue to mature, though the rate is not the same as when things are a little cooler.

I think you need to be past the mid 90s to get to the point where the growth has decreased to where you would notice- That is my opinion based only off growing.

I'm really interested in this topic, so I'm hoping someone has an argument based on some providable research.
 
C

CelebrityKush

Member
thanks for the input everyone. :rasta:

the temps are getting crazy where i'm at....so i had to say f-it and get a new ac unit. they had some cheap "in room" units at the depot....not as good as my last unit, but it will do. I have it set to 80f, so that way it doen'st have to run constantly. seems to keep the room between 79-82...i'm happy.

on a side note....what are the best yields you have attianed. the best i've ever gotten was about 440g with a 600 watt light, which was 4x4 canopy in soil with no co2. from anything i've ever seen, that whole "1g per watt" rule seems unattainable. :joint:
 
C

CelebrityKush

Member
nice pics pompey monkey... :rasta:

i am wondering if you use some kind of fish based fertilizer.

on the 2nd to last picture....the fan leave on the lower right looks like it has a lot of spacing between the blades. I have used the GHBB fish mix and also the alaskan fish fertilizer in the past and both times the fan leaves had more spacing between the blades and looked very similar to yours. :rasta:
 
C

CelebrityKush

Member
dontstepongrass....

have you ever gotten more that 1g per watt yourself...or have actually seen someone else do it. i've done sog, but i guess i wasn't doing it right. is there an optimal # of plants per light?...is co2 neccessary?
any additional info would be appreciated. or if you know of another thread that deals with this, please post the link. thanks :rasta:
 
T

trem0lo

In soil you may be able to run temps hotter because the rootball is more protected from the heat. Anything above 85 is pushing it and 88 would be the absolute max IMO.
 
T

trem0lo

^^^I should add that when running at those temps good ventilation and air circulation is a must.
 
Maj.PotHead

Maj.PotHead

End Cannibis Prohibition Now Realize Legalize !!
Mentor
Veteran
dontstepongrass said:
dr bud does 2+ gpw in a zero veg sog with cfl's. go to the micro grow forum...
Click to expand...
wet or dry weight for 2+ gpw in a zero veg sog with cfl's ??? i'm off to read this just to good to believe
 
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Pompey_Monkey

Member
Skrappie - I hear what you're saying and very possibly they would've done better with lower temps. Unfortunately I didn't have a control sample! ;-D
I'd love to get an A/C unit, but the noise and access limitations make it a no-no for security reasons! :(

CelebrityKush - Miracle grow general plant food. No fish heads, worm poo or bird droppings yet!
Thanks for the compliments - I hope you have as much as me luck too!

Monkey
 
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