Sealed grow room temp question ?

R

RamK

Member
I research this question and see few difference opinions. Some said 30-35C is best for 1200-1500 enrichment with 1000hps light, others said do not let temp goes over 30. Need some expert advise, thank you so much !
 
C

claypipe69

Well-Known Member
It depends on the strain your growing, rule of thumb though low altitude sativa s can handle high temps with high humidity levels. So really it depends what you want to grow? Some can handle up to 40 c +:leaf::joint::bigjoint::leaf:
 
SPLFreak808

SPLFreak808

Well-Known Member
Unless you can keep the pots cool i wouldn't go higher then 30c ambient which is fine, its more about how much light hits the canopy that will determine foliage temp and co2 requirements.
 
Nugachino

Nugachino

Well-Known Member
Heh. I was wondering the same thing actually. As I've got quite a small grow cab. And it can get as hot as 42°c in summer. I get a difference of +5-10°c than the room it's in. With light at full tilt.
 
xmatox

xmatox

Well-Known Member
RamK said:
I research this question and see few difference opinions. Some said 30-35C is best for 1200-1500 enrichment with 1000hps light, others said do not let temp goes over 30. Need some expert advise, thank you so much !
Click to expand...
I would look up VPD when you decide on a temperature, so you can adjust your humidity. I personally run my canopy temps around the high 80's and they do well, but I have my system dialed in.
 
linky

linky

Well-Known Member
xmatox said:
I would look up VPD when you decide on a temperature, so you can adjust your humidity. I personally run my canopy temps around the high 80's and they do well, but I have my system dialed in.
Click to expand...
I just looked up VPD, was not familiar with it.. very interesting and also tells me I am running my humidity to low. Been at ~50 percent rh with mid to high 80's canopy temps while running co2. Maybe I will lower temps a little and up humidity to 65 percent range.. don't want molds.. but also want the plants to be happy. My sealed room is new and only about 2 weeks into flower.
 
xmatox

xmatox

Well-Known Member
linky said:
I just looked up VPD, was not familiar with it.. very interesting and also tells me I am running my humidity to low. Been at ~50 percent rh with mid to high 80's canopy temps while running co2. Maybe I will lower temps a little and up humidity to 65 percent range.. don't want molds.. but also want the plants to be happy. My sealed room is new and only about 2 weeks into flower.
Click to expand...
When I first learned about vpd, I moved my rooms temperature to 75º and run 65º RH through veg, and through flowering until week 6. I'll start to taper down to 55% / 60% RH. I also bring the temperature down slowly at this point too. Trying to keep the VPD equal as best as a can until I feel like it's too cold for my plants or to hot. Honestly, I have never had an issue with mold since using the VPD chart and it's been a few years. Not saying it will happen to you, but don't be afraid to try it out.

Lower your lights to your plants, and get a canopy temp of 80+. This will put good use to your co2. If your plant is under normal conditions, a surplus of co2 is more than likely a waste. You need to have optimal conditions in order for co2 to make a difference increasing your yield. Canopy @ 80º will make your plants more thirsty, so feeding up to twice a day can be common. Canopy at 80º doesn't mean your room is at 80º, just the canopy. My canopy temps may be 85º, but my room is still 75º. It's all in how close you put your lights to your plants. IDK where you are located, but a temp gun can be your best friend. A hardware store should carry this.
 
R

RamK

Member
xmatox said:
When I first learned about vpd, I moved my rooms temperature to 75º and run 65º RH through veg, and through flowering until week 6. I'll start to taper down to 55% / 60% RH. I also bring the temperature down slowly at this point too. Trying to keep the VPD equal as best as a can until I feel like it's too cold for my plants or to hot. Honestly, I have never had an issue with mold since using the VPD chart and it's been a few years. Not saying it will happen to you, but don't be afraid to try it out.

Lower your lights to your plants, and get a canopy temp of 80+. This will put good use to your co2. If your plant is under normal conditions, a surplus of co2 is more than likely a waste. You need to have optimal conditions in order for co2 to make a difference increasing your yield. Canopy @ 80º will make your plants more thirsty, so feeding up to twice a day can be common. Canopy at 80º doesn't mean your room is at 80º, just the canopy. My canopy temps may be 85º, but my room is still 75º. It's all in how close you put your lights to your plants. IDK where you are located, but a temp gun can be your best friend. A hardware store should carry this.
Click to expand...
Very clear, thanks alot
 
linky

linky

Well-Known Member
I tried getting my humidity up to even 60 percent and lowering room temp to 76 (low 80's canopy temp) but could not get the rh past 55 percent. I have a humidifier I am going to setup and use to get rh up to where it needs to be and see how things go.
 
xmatox

xmatox

Well-Known Member
linky said:
I tried getting my humidity up to even 60 percent and lowering room temp to 76 (low 80's canopy temp) but could not get the rh past 55 percent. I have a humidifier I am going to setup and use to get rh up to where it needs to be and see how things go.
Click to expand...
Awesome man. You can put the humidifier on a timer instead of running it 24/7 and fighting the humidity with a dehumidifier. See how long it takes to get your humidity up and stable where you want it, then see how long it will stay in your room that way. Start with 30 mins on, 30 mins off. I run the humidifier on a timer in my clone room so a dome isn't needed.
 
You must log in or register to reply here.
Top