Heat problems and yield

K

Kubizm

Member
IMG_5535.JPG So I've been growing Cali Orange, first run.
I'm about half way through flowering week 4,
I have never really been able to keep my temps below 30C
Averaging about 32-34C

It's mid summer here and outside temps are averaging 30-35C

My question is how badly will this heat cause my yield?
My girl is starting to show signs of heat stress now :(

Cheers!
 
K

Kubizm

Member
I have a 100mm exhaust fan, and 3 100mm intake holes on different corners, small fan inside cabinet.

The fan is from the local hardware store,
On the box it says it moves 105cm/h (I thought it was cm/m when I got it)
My flower room is 800x500x1800 - 25.35 cubic feet

So I need a fan with a rating of 50CFM preferably 75CFM+

If you convert foot to metre,

CFM x 0.03 x 60

25.35 x 0.03 x 60 - 45.63 cubic metres (seems a little big)

Then my flower room needs a fan of 91.26cm/m

BUT..

If you convert the CM/h to CM/m
Then the 105CM/h equals to 1.75CM/m
(1 m3/h = 0.016667 m3/min; 1 m3/min = 60 m3/h)

But convert the 1.75CM/m to CFM and it equals 61.8 CFM

So fucking confused!

Is my fan good enough? Hahah
 
chemphlegm

chemphlegm

Well-Known Member
Kubizm said:
View attachment 3861878 So I've been growing Cali Orange, first run.
I'm about half way through flowering week 4,
I have never really been able to keep my temps below 30C
Averaging about 32-34C

It's mid summer here and outside temps are averaging 30-35C

My question is how badly will this heat cause my yield?
My girl is starting to show signs of heat stress now :(

Cheers!
Click to expand...


bigger fans(?) and cold air will cool your space better.

your plants are suffering, wont get better, and may seriously disappoint you when harvested, unless you cool the space.
 
ismann

ismann

Well-Known Member
I don't see anything helping other than an air conditioner.

Need a bigger fan also. 6" at least. But if your ambient air is already hot, a fan won't help.

I live in Florida and we're still hitting 27 C to this day.

Temps should be kept under 27 C in reality.
 
A

andy260881

New Member
I have struggled with my temps I have a heavily insulated loft and my first grow was a nightmare to maintain the temp

I removed the light ballast from the room brought a 5" cool tube and fan to match

I added a 4" inlet fan to one end then a 4" outlet fan the other end so to create like a wind tunnel

I found with previous grows that having the inlet and outlet not in direct line made the air circulation act like a fan assisted oven

give it ago before shelling out for an air con unit, it worked for me
 
K

Kubizm

Member
The air con would be cheaper then buying air cooled hood and new fan, its fucked haha.
Air con for $90
Or the cool tube alone for $100, fan for $60

Even thinking about going out of the cabinet and using the actual room the cabinets in (spare room) but I'm renting so don't know how I'd go about doing it
 
A

andy260881

New Member
That's mad over here in the U.K. You can grab your self 600 HPS cool tube reflector ballast ducting and fan for what would be 70$

I can see why air con is so appealing

Let me know how it works out
 
666888

666888

Well-Known Member
Run the lights at night to flower, that's what I do in summer
We get 35-40c during the day, only run an inlet fan and a circulating one
never had a problem with heat stress
 
K

Kubizm

Member
Yeah I've got them to run at night but I don't honk i have them set late enough, 5pm - 5am,
If I have the lights off for 24h can I change the schedule to something like 8:30pm-8:30am or 9-9?
 
K

Kubizm

Member
Would it be best to have them in 24 dark period before changing the schedule, or while the lights on change the timer to go off at 10 instead of 5, then back on at 10?
 
K

Kubizm

Member
I think ya fan isn't strong enough,
Can barely feel any suction through the intakes when the cab is closed :/
An upgrade may be in order
 
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