Having a hard time keeping temps under control

M

Michael Phelps

Well-Known Member
The plants are about 3 weeks old and i think the growth could be stunted due to excessive heat, The temps at night are about 78 degrees and the temps during the daylight cylce are getting upwards around 88 degrees. The grow cab is 3 ft wide, 3 feet deep, 4 feet tall. I have one exhaust fan in the upper corner and then 5 1 1/2 inch intake passive holes closer to the bottom. Ive also been alternating 2 frozen buckets with a fan over them to keep the heat down and its still reaching almost 90 degrees.

If anyone could help that would be great
 
I had a similar issue. I put another intake with a fan at the top of the box to cool my lights. Just make sure the intake fan is lower cfm than the exhaust fan.
 
i dont know what exactly to tell you to do, but you need to find some way to get it a little cooler. maybe another fan or a more powerful fan. my grow room is a closet and i dont have any air circulation at night, so i was a little worried too, but my one plant is doing alright. is your set-up in a hot area of your house or are the lights you are using just produce a lot of heat?
 
grimreefer24601 said:
I had a similar issue. I put another intake with a fan at the top of the box to cool my lights. Just make sure the intake fan is lower cfm than the exhaust fan.
Click to expand...

That may be the problem because the intake fan is bigger then the exhaust fan.

Here is a couple pics, is it heat stress or do you think it could be something else?

CIMG0665.jpg


CIMG0671.jpg


CIMG0672.jpg


CIMG0676.jpg


CIMG0677.jpg
 
eagles1090 said:
i dont know what exactly to tell you to do, but you need to find some way to get it a little cooler. maybe another fan or a more powerful fan. my grow room is a closet and i dont have any air circulation at night, so i was a little worried too, but my one plant is doing alright. is your set-up in a hot area of your house or are the lights you are using just produce a lot of heat?
Click to expand...

Ya i think im gonna add a couple computer fans and see if it works, but its in an area thats always around 70 degrees or so.

Im using 6 cfls.

Like i said the plants are about a month old, and from comparing them to other month old plants the growth looks hella stunted!
 
Try a different type of soil. One might work better than the other. But in this case looks sort of like the problem. Just was looking at another thread in this section and a guy had the same complications as you do. Search around. Also, any un-natural ways of feeding (fertilizers) should not be applied at this beginning stage of vegetation. Make sure your soil filters correctly when adding water to it. Otherwise your plant cant get proper nutrition. Feel free to do a little test of the dirt, dig in on the outside perimeter a few inches down to see if water is properly settling into the roots. If this process is ignored, and underwatering is being done, then rootbound could be the issue.
 
The biggest thing for lowering my box temps was ihe intake at the top. I've tried my intake at the bottom, but all the cool air stays at the bottom of the box. My room stays pretty cool, so the upper intake blows cool air in that drops inside the box. My temps were in the 90's now they're about 80. I'm using an 80 cfm exhaust fan and a 50 cfm intake fan. Both computer case fans from Best Buy for less than 10 bucks each.
 
michaelsto said:
Try a different type of soil. One might work better than the other. But in this case looks sort of like the problem. Just was looking at another thread in this section and a guy had the same complications as you do. Search around. Also, any un-natural ways of feeding (fertilizers) should not be applied at this beginning stage of vegetation. Make sure your soil filters correctly when adding water to it. Otherwise your plant cant get proper nutrition. Feel free to do a little test of the dirt, dig in on the outside perimeter a few inches down to see if water is properly settling into the roots. If this process is ignored, and underwatering is being done, then rootbound could be the issue.
Click to expand...

when checking through the soil am i just supposed to be making sure it saturated all the way through and had good drainage?
 
grimreefer24601 said:
The biggest thing for lowering my box temps was ihe intake at the top. I've tried my intake at the bottom, but all the cool air stays at the bottom of the box. My room stays pretty cool, so the upper intake blows cool air in that drops inside the box. My temps were in the 90's now they're about 80. I'm using an 80 cfm exhaust fan and a 50 cfm intake fan. Both computer case fans from Best Buy for less than 10 bucks each.
Click to expand...

okay ill try it, i think i might just build a new cab because the one ive been using opens from the top so it makes it hard to hang lights and everything.
 
look into an air conditioned ionizer from walmart...it generates cool air they come in different sizes I had same problem picked up the one i felt blew the coldest in the store threw it in my room full blast and actually made the room to cold i had to turn it down but none the less I dropped my temp over 15 degrees with this
 
I do this. Just because it allows me to understand if the plant is properly getting water. Also when I dig around the perimeter, I throw that "barely" unused soil towards the middle. This allows the soil that is barely being used to release the nutrienal value of the soil to the rest of the plant. GOODLUCK
 
michaelsto said:
I do this. Just because it allows me to understand if the plant is properly getting water. Also when I dig around the perimeter, I throw that "barely" unused soil towards the middle. This allows the soil that is barely being used to release the nutrienal value of the soil to the rest of the plant. GOODLUCK
Click to expand...

Thanks for all your help.
 
So i went and picked up 2 case fans and hooked them up ac adapters, One spins faster then the other, should my intake be the faster of the two? Or my exhaust?
 
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