12 x 18 4800w Grow Room Getting Too Hot...Help!!

[jokerjon00]

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

 

[CouchlockOR]

you need vented hoods

 

[CouchlockOR]

I would say 80-85F max with 1500 ppm of co2

 

[CouchlockOR]

You can still have a sealed room and have vented hoods.

 

[sdf]

yup, get air cooled hoods. should've done that before getting that ac

 

[ScoobyDoobyDoo]

those temps have a very good chance of creating problems for you. some strains might be able to handle them but not most. and definitely not ideal for growing.

i don't see any quick fix to the problem. in my opinion you either have to get more a/c or vent your hoods. a/c would probably be the easiest way with one already begin there. i'd go with a 4 ton. the issued is that bare bulb that is too much heat in that room for only 2 tons. summer is only gonna get worse. i'd bite the bullet and step up to a 4 ton. 102 degrees on flood tables is gonna lead to some serious reservoir issues unless you have a chiller.

i'm not a mini split expert cause we don't work with them but i think it would be more efficient to get a 4ton than to just add another 2 ton. even if electricity bill isn't an issue i think they end up being detrimental to each other somehow. can't remember the physics but i'm pretty sure someone explained it to me a few times.

going with ducted hoods will be a lot more work and probably just as expensive. 8 hoods, 3-4 fans, ducting, an exhaust port, filter, etc... that's even if you have a place to exhaust it.

good luck man. really nice setup otherwise. i'm interested to see where this goes.

 

[Guy Dasilva]

Couch lock nailed it for sure. Vented hoods with 6" or preferably 8" vents. A nice in line fan, a charcoal air scrubber is necessary unless you are not worried about the smell, it will stink!

Sent from my HTC6500LVW using Rollitup mobile app

 

[jokerjon00]

Couch lock nailed it for sure. Vented hoods with 6" or preferably 8" vents. A nice in line fan, a charcoal air scrubber is necessary unless you are not worried about the smell, it will stink!

Sent from my HTC6500LVW using Rollitup mobile app

I have a 12" 4ft CarbonFilter running 24/7 in the room. If I vent the hoods I'll still need another filter or will this suffice?

those temps have a very good chance of creating problems for you. some strains might be able to handle them but not most. and definitely not ideal for growing.

i don't see any quick fix to the problem. in my opinion you either have to get more a/c or vent your hoods. a/c would probably be the easiest way with one already begin there. i'd go with a 4 ton. the issued is that bare bulb that is too much heat in that room for only 2 tons. summer is only gonna get worse. i'd bite the bullet and step up to a 4 ton. 102 degrees on flood tables is gonna lead to some serious reservoir issues unless you have a chiller.

i'm not a mini split expert cause we don't work with them but i think it would be more efficient to get a 4ton than to just add another 2 ton. even if electricity bill isn't an issue i think they end up being detrimental to each other somehow. can't remember the physics but i'm pretty sure someone explained it to me a few times.

going with ducted hoods will be a lot more work and probably just as expensive. 8 hoods, 3-4 fans, ducting, an exhaust port, filter, etc... that's even if you have a place to exhaust it.

good luck man. really nice setup otherwise. i'm interested to see where this goes.

Yeah I mean I already bought 8 adjustawings. Dont feel like buying another 8 vented hoods, but how much would venting the hoods bring the temperature down? 10 degrees, 20 degrees?

 

[CouchlockOR]

I have 4 1000k HPS lamps in 8" vented hoods and a 10" vortex fan and I can touch my hood glass all day long. I can control my ambient room temps with in 2 degrees F with a 15,000 BTU dual vent a/c unit.

Also my a/c isn't running all day.

 

[CouchlockOR]

Take the bat wings back and get the right equipment.
You would have been better off asking these questions before going out and buying hundreds of dollars worth of wrong equipment.

 

[AlGore]

Already said but replace them heat collecting wings with some cool tubes and suck the hot air away from the lamps with ducting and vortex fans.

 

[jokerjon00]

Take the bat wings back and get the right equipment.
You would have been better off asking these questions before going out and buying hundreds of dollars worth of wrong equipment.

I did ask these questions. Originally was going to buy 8 - 8" blockbusters hoods, but numerous sources said 24k btu should be able to handle 4800w and even excelair's website recommends a 24k btu ac unit. So figured why go through th hassle of running ducting to cool the hoods and worry about condensation on the glass, etc.

 

[ScoobyDoobyDoo]

Yeah I mean I already bought 8 adjustawings. Dont feel like buying another 8 vented hoods, but how much would venting the hoods bring the temperature down? 10 degrees, 20 degrees?

you already have the plumbing and electrical. bumping up to a 4 ton would be the easiest and cheapest way in my opinion. maybe add a few more wall fans too.

it's impossible to tell exactly what adding vented hoods will do to your temps. also, what is the temp of the air you'd be pulling through the hoods? i would GUESS that at least 10-15 degrees less though. problem is you may find your plants don't like it at 87 and that it's also too hot for your res if you don't have a chiller. plus, that's a lot more work swapping all that out.

if you decide to go with vented hoods then you will need to hook them up to the filter you have or get additional small ones.

 

[sdf]

I've seen people hook 4 600Ws together with ducting and use 1 8" fan and keep it cool. Sell those reflectors on ebay or something, and sorry some people gave you that info, They probably have never ran that set up before so just guessed using thumbs and dumps

 

[ScoobyDoobyDoo]

I did ask these questions. Originally was going to buy 8 - 8" blockbusters hoods, but numerous sources said 24k btu should be able to handle 4800w and even excelair's website recommends a 24k btu ac unit. So figured why go through th hassle of running ducting to cool the hoods and worry about condensation on the glass, etc.

running bare bulb has it's advantages for sure. only hassle is you have to clean your bulbs more often. whoever told you 2 tons of a/c for 4800w and Co2 was way off in my opinion. getting wall fans to blow heat off the bulbs will help if you don't have them already. won't drop the temps that far though.

 

[jokerjon00]

you already have the plumbing and electrical. bumping up to a 4 ton would be the easiest and cheapest way in my opinion. maybe add a few more wall fans too.

it's impossible to tell exactly what adding vented hoods will do to your temps. also, what is the temp of the air you'd be pulling through the hoods? i would GUESS that at least 10-15 degrees less though. problem is you may find your plants don't like it at 87 and that it's also too hot for your res if you don't have a chiller. plus, that's a lot more work swapping all that out.

if you decide to go with vented hoods then you will need to hook them up to the filter you have or get additional small ones.

I have electric, but only 20 amp outlet for the 2ton unit. Had all electric wired before room was set up, and dont really want guy coming out now to set up another 20 amp and asking m if Im setting up an ice bar in there lol.

 

[ScoobyDoobyDoo]

I have electric, but only 20 amp outlet for the 2ton unit. Had all electric wired before room was set up, and dont really want guy coming out now to set up another 20 amp and asking m if Im setting up an ice bar in there lol.

i hear ya. if it isn't far from you breaker panel to the condenser/compressor outside then i'd say just run new wiring. you might not even need new wiring if the electrician went above code. you might have to switch out the breaker. is it 220v? it's not like a 4 uses twice the electricity either though. you might be able to get a 4 ton and use the same circuit.

you'd still have to have someone come in and mount, connect, and charge the new unit. decision you'll have to make.

 

[CouchlockOR]

I did ask these questions. Originally was going to buy 8 - 8" blockbusters hoods, but numerous sources said 24k btu should be able to handle 4800w and even excelair's website recommends a 24k btu ac unit. So figured why go through th hassle of running ducting to cool the hoods and worry about condensation on the glass, etc.

Salesman crap. Talk to an HVAC guy. There won't be any condensation on the glass. Maybe on the ducting.

 

[jokerjon00]

Cool, well whats best air cooled hood that will cover 3x3 area and what size fan if i have 2 rows of 3 hoods with 600w hps in each and one row of two both with same 600w hps

 

[CouchlockOR]

I'm using an atmosphere 10" vortex fan. 790 cfm. Works like a dream. MSRP (catalog price) 290.00 I got mine for 200.00 new. If you daisy chain or link the hoods together it will take more fan to cool them. If you run two banks of 3, 600w HPS 6" hoods I'd say a 700 cfm minimum.