4800w Grow Room Getting Too Hot...Help!?!

J

jokerjon00

Well-Known Member
Hey

Set up my grow room in 12 x 18 room. It is completely sealed. Have a 4x8 tent with 8 mothers in it, 8 3x3 trays and 8 Adjustawings with 600w HPS in each and a 24,000 btu MiniSplit A/C. Running CO2 at 1250ppm.

My mothers are about 2 months old now and I'm just getting ready to cut clones and start setting everything up for flowering so I decided to turn on all my lights and see how everything would go. Well It got real hot! I set the AC to 60 degrees and the room was still 89 degrees. The lights were about 2 ft above the trays and when I put the "outside" probe in the tray the temp read 102...

I need help. I thought a 2 ton, 24,000 btu ac should have been enough to do the job, and especially with it being winter. What did I do wrong? How can I get temp down? Or with CO2 are these temps ok?

Thanks


View attachment 2960197View attachment 2960198
 
Dr. Who

Dr. Who

Well-Known Member
Time to spring for air cooled hoods. Air from outside room, exhausting to outside of room......Be aware that if you take air from outdoors. You may get a condensation problem, so apply accordingly.
 
ThorGanjason

ThorGanjason

Well-Known Member
How long did it take to get to that temperature? That temp is definitely on the hot side, but would probably be alright. You gotta figure, these plants are meant to sit outside in 90° summer heat, ya know.

So the rooms completely sealed? If you can afford it, you might need to get another ac unit in there. What's the outside temps like in your area? You might be able to just get a powerful inline fan, and have an air intake from outside setup to a temp controller so that when it gets over a certain temp, the fan kicks on and pulls cold air in from outside. That's what my buddy in Colorado does, and it also helps ventilate the co2 out for when you are in there working, so you don't get a headache (from the co2).

Every time he walks in there he just cuts the temp down, it automatically turns on the fan and pulls fresh air in and the inside air out.

Your only other option might be to just run the lights at night? Also, have you looked into the "cool air misters"? They spray a water mist into the room, and the heat energy is used to convert the liquid water into a gas, thus decreasing temps. But if humidity is a problem then those will only make it worse.
 
J

jokerjon00

Well-Known Member
Dr. Who said:
Time to spring for air cooled hoods. Air from outside room, exhausting to outside of room......Be aware that if you take air from outdoors. You may get a condensation problem, so apply accordingly.
Click to expand...
Was originally thinking aircooled, but heard about condensation issues. What does this entail? Just cleaning the glass or?

ThorGanjason said:
How long did it take to get to that temperature? That temp is definitely on the hot side, but would probably be alright. You gotta figure, these plants are meant to sit outside in 90° summer heat, ya know.

So the rooms completely sealed? If you can afford it, you might need to get another ac unit in there. What's the outside temps like in your area? You might be able to just get a powerful inline fan, and have an air intake from outside setup to a temp controller so that when it gets over a certain temp, the fan kicks on and pulls cold air in from outside. That's what my buddy in Colorado does, and it also helps ventilate the co2 out for when you are in there working, so you don't get a headache (from the co2).

Every time he walks in there he just cuts the temp down, it automatically turns on the fan and pulls fresh air in and the inside air out.

Your only other option might be to just run the lights at night? Also, have you looked into the "cool air misters"? They spray a water mist into the room, and the heat energy is used to convert the liquid water into a gas, thus decreasing temps. But if humidity is a problem then those will only make it worse.
Click to expand...
Are you saying just set up an intake or intake and exhaust? Sounds like both and since temps are hot when lights are on would need air the whole 12 hours and this wouldnt be efficient for c02
 
M

MedicatedGrow

Active Member
Suck air out of the aircooled hoods and blow it outside

Don't need to suck in air from outside if you have a 2ton A/c

Make sure you use a filter if you're trying to hide it all
 
Bucees

Bucees

Well-Known Member
MedicatedGrow said:
Suck air out of the aircooled hoods and blow it outside

Don't need to suck in air from outside if you have a 2ton A/c
Click to expand...

This gets my support. Smallish enclosed grows with low ceilings just can't pull off passive cooling. Your fans are just going to be blowing around incredibly hot air. With hoods you will be able to adjust the amount of heat in the room for a more stable co2 enrichment as well.
 
J

jokerjon00

Well-Known Member
Bucees said:
This gets my support. Smallish enclosed grows with low ceilings just can't pull off passive cooling. Your fans are just going to be blowing around incredibly hot air. With hoods you will be able to adjust the amount of heat in the room for a more stable co2 enrichment as well.
Click to expand...
If I suck air from room through the hoods and outside then the co2 Im pumping in will go out as well. Doesnt seem like it would help co2 enrichment...
 
Bucees

Bucees

Well-Known Member
jokerjon00 said:
If I suck air from room through the hoods and outside then the co2 Im pumping in will go out as well. Doesnt seem like it would help co2 enrichment...
Click to expand...
Perhaps I should have been more specific. Most large grows daisy chain hoods with ducting and have a fresh air intake. You suck air from a adjacent room and expel heat elsewhere. Have a look on youtube.
 
J

jokerjon00

Well-Known Member
Bucees said:
Perhaps I should have been more specific. Most large grows daisy chain hoods with ducting and have a fresh air intake. You suck air from a adjacent room and expel heat elsewhere. Have a look on youtube.
Click to expand...
Gotcha. So can I pull air from boiler room run through hoods and out of house? Sucks Im gonna have to drop like 1600 on new hoods now...
 
ThorGanjason

ThorGanjason

Well-Known Member
jokerjon00 said:
Was originally thinking aircooled, but heard about condensation issues. What does this entail? Just cleaning the glass or?



Are you saying just set up an intake or intake and exhaust? Sounds like both and since temps are hot when lights are on would need air the whole 12 hours and this wouldnt be efficient for c02
Click to expand...
Yeah, intake and exhaust, and you only run them for like 60 seconds a couple times a day. Then you can line all your hoods up, and connect a smaller ac unit up to push through the air cooled hoods; condensation is lessbpf a problem this way.

My buddy in Colorado runs 8k watts this way and keeps his temps pretty steady @ 75° @ the canopy. If done correctly it works and doesn't waste co2. And trust me, if you've ever gotten a co2 headache then you'd appreciate the ability to purge the room if you're gonna be working in there for a while.
 
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