Heat problems 2000watt grow

They look good. If the temps are still too high its not hurtimg anything. Theyre all short and squat. If your not able to pull enough cool from that stand up unit id grab a window unit too. They should be on craigslist for cheap real quick. Nice plants.

I was running into a similar issue in my flower room. running 3x600hps in a/c big kahuna hoods with TWO x 8" 720 cfm fans at 100%, 14k btu a/c set to 65* runs 12/12 and an 8" 440cfm intake fan sucking in a/c air (a/c on fan speed 3, intake fan at 95%). I also have 3x18" oscillating fans blowing under each hood and 4x 10" fans blowing cold air on floor up to the ceiling. and a massive carbon scrubber with an 8" 20 cfm fan NOW turned down to 75%. when I had the exhaust at 100%, it was sucking all the cold air out before the a/c and intake could supply in in the room (room is a sealed built/framed room with SIX overlapping layers (floor/walls/ceiling).

since I dialed down the scrubber fan, im sitting very comfortable at 73-75* light on. before was 79-82*.

i have between 12-18 plants all the time flowering.

so try dialing down the exhaust a tad and see what happens. I do have a slight positive pressure I my room, but no smell outside.

DemonTrich said:

I was running into a similar issue in my flower room. running 3x600hps in a/c big kahuna hoods with TWO x 8" 720 cfm fans at 100%, 14k btu a/c set to 65* runs 12/12 and an 8" 440cfm intake fan sucking in a/c air (a/c on fan speed 3, intake fan at 95%). I also have 3x18" oscillating fans blowing under each hood and 4x 10" fans blowing cold air on floor up to the ceiling. and a massive carbon scrubber with an 8" 20 cfm fan NOW turned down to 75%. when I had the exhaust at 100%, it was sucking all the cold air out before the a/c and intake could supply in in the room (room is a sealed built/framed room with SIX overlapping layers (floor/walls/ceiling).

since I dialed down the scrubber fan, im sitting very comfortable at 73-75* light on. before was 79-82*.

i have between 12-18 plants all the time flowering.

so try dialing down the exhaust a tad and see what happens. I do have a slight positive pressure I my room, but no smell outside.

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amazing grow setup man!!! I bet your finished medicine is absolutely phenomenal!.... lol. My 6 inch dustshroom came in yesterday, so I have my 8 inch exhausting now and my 6 inch as an intake. It's 78 right now with the AC set on low fan and 73 degrees but only under two two foot t5s (one 4 site, one 8 site). I have the exhaust turned to about 35% and my intake the lowest the ideal air control will take it. Temperatures have been much better with less energy. Now my humidity is staying around 40-50% (where I want it for veg) instead of 15%.

Do you notice much temperature loss with slight positive pressure, or is it mainly just a smell leak issue with positive pressure? I've always wanted a positive pressure grow for sanitary purposes, but I thought it would make cooling too difficult. You don't seem to be having ANY issues with those temperatures. Good job again man!

no issues at all with the slight positive pressure. no real smell either. still running consistent 73-75* no matter what the temp is outside.

check out the VDP chart im going to post up below. you want to match your room temp with the proper humidity value for the optimal growth rate for veg and flower. my veg room runs about 82-84* lights on and my rh is 70-75% (it fluctuates). 70% is a tad low on the scale, but is above average and im happy and my plants are extremely happy. I had a growth spurt of almost 1' in a week since I added and dialed in my ultrasonic fogger, just keep the air moving and NO issues of mold/mildew. I did hit them with a feeding, so that did help in a way im sure.

DemonTrich said:

I was running into a similar issue in my flower room. running 3x600hps in a/c big kahuna hoods with TWO x 8" 720 cfm fans at 100%, 14k btu a/c set to 65* runs 12/12 and an 8" 440cfm intake fan sucking in a/c air (a/c on fan speed 3, intake fan at 95%). I also have 3x18" oscillating fans blowing under each hood and 4x 10" fans blowing cold air on floor up to the ceiling. and a massive carbon scrubber with an 8" 20 cfm fan NOW turned down to 75%. when I had the exhaust at 100%, it was sucking all the cold air out before the a/c and intake could supply in in the room (room is a sealed built/framed room with SIX overlapping layers (floor/walls/ceiling).

since I dialed down the scrubber fan, im sitting very comfortable at 73-75* light on. before was 79-82*.

i have between 12-18 plants all the time flowering.

so try dialing down the exhaust a tad and see what happens. I do have a slight positive pressure I my room, but no smell outside.

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Nice man I was just wondering why you didn't leave the temps around 79-82, through the years I have found that to be the temps they seem to love the most and would seem you wouldn't need to run the ac as much

I don't like anything over 75 for flower (77 max). veg I like 81-84 max. and last 2 weeks in flower I run even cooler and always have super yields. this yield is a super yield, WELL above my normal expected harvest.

DemonTrich said:

no issues at all with the slight positive pressure. no real smell either. still running consistent 73-75* no matter what the temp is outside.

check out the VDP chart im going to post up below. you want to match your room temp with the proper humidity value for the optimal growth rate for veg and flower. my veg room runs about 82-84* lights on and my rh is 70-75% (it fluctuates). 70% is a tad low on the scale, but is above average and im happy and my plants are extremely happy. I had a growth spurt of almost 1' in a week since I added and dialed in my ultrasonic fogger, just keep the air moving and NO issues of mold/mildew. I did hit them with a feeding, so that did help in a way im sure.

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Thanks for the excellent info!!! I was wondering if you could give me tips on helping me increase my humidity for my tent space. I'm moving a decent amount of air, and will be moving even more with the HPS running. I'm worried the room will get super dry.

What type of humidifier do you recommend, and where should I place it? Tent size again is 8x4x6.6. Running 9 seedlings and worried a little about crowding during flower. I'm used to dehumidifying, and I don't want to just suck out all my humidity immediately from needing to cool my hoods down. I guess I would need to exhaust my lights separately from my grow space? Damn it.

Do you have a Titan controller or something similar to coordinate your fans/temperature with your humidifier? I'm hoping not to invest that much, but am willing to drop a few hundred on a nice humidifier. I'm also hoping not to have to redesign my HVAC again.

They obviously still have plenty of room to grow. I got caught up with work and underfed my babies badly. Got them drinking 1100 ppm nutes and they are loving it. Will increase it more next feeding. I starved them! . I have a few days off, so I'm going to get them back in order and start training them more. Yes, they have an N deficiency, as well as calcium and Sulfur, but the nutes seem to be correcting it.

Thanks again for the input.

I run an ultrasonic fogger system from houseofhydro.com. I use their 9 disc system and a fan speed controller matted to an 80mm waterproof fan in a 17gallon container. by adjusting the fan speed, I can control the humidity output. 6v (fan speed) gives me 62-66%, 7.4v (next speed up) gives me 72-77%. I wish there was a 7v option, as that might be the sweet spot for my room.

this unit is a little pricey, at around 200.00 (or the price of an ounce to my patients). but well worth it.

since ive placed this unit in my tent, ive had explosive growth the last 3 weeks. more growth that I had intended (about 1'), now I may run out of room after the stretch when I flip.

I run separate exhaust for everything. hoods have their own duct and fan, tent has own duct work and fan. same in my flower room. I keep everything separate to dial in each part of the grow as needed and for the conditions/season.

if you email houseofhydro.com, ask for John, he is the owner. awesome dude and very helpful. tell him Dave sent ya with the 9 disc fogger. he will take care of ya.

DemonTrich said:

I run an ultrasonic fogger system from houseofhydro.com. I use their 9 disc system and a fan speed controller matted to an 80mm waterproof fan in a 17gallon container. by adjusting the fan speed, I can control the humidity output. 6v (fan speed) gives me 62-66%, 7.4v (next speed up) gives me 72-77%. I wish there was a 7v option, as that might be the sweet spot for my room.

this unit is a little pricey, at around 200.00 (or the price of an ounce to my patients). but well worth it.

since ive placed this unit in my tent, ive had explosive growth the last 3 weeks. more growth that I had intended (about 1'), now I may run out of room after the stretch when I flip.

I run separate exhaust for everything. hoods have their own duct and fan, tent has own duct work and fan. same in my flower room. I keep everything separate to dial in each part of the grow as needed and for the conditions/season.

if you email houseofhydro.com, ask for John, he is the owner. awesome dude and very helpful. tell him Dave sent ya with the 9 disc fogger. he will take care of ya.

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Thanks so much man. Any ideas on flower to produce not so much humidity? Just lower the fan speed? Does your setup produce so much humidity, that you don't have much problems sucking too much moisture out of your tent? I like the fogger idea for veg, I just need to figure out a way I can keep air exhausting out without sucking too much humidity too. Do you use a humidifier in flower at all in the dry season? I would think the fan would be cooling too much for a humidifier to do its job.

I would like to keep it around 20-30 % rh if possible during flower. It will get around 15% humidity here during the winter. Do you think nine 5-gallon smart pots with coco would produce enough humidity for flower? I think I need a humidifier.

since I grow underground, I don't worry whats happening with temps outside. my underground temps are pretty stable year round. iirc, my flower r/h is between 50-65%, occasionally dipping into the high 40's. I only run the fogger in the veg room. i run it 5hrs on, 45m off, 5hrs on, 45m off, back on and turn off 2hrs before lights out. and i still, keep 68% lights off until lights on. flower i really don't bother too much with r/h, i like it on the low side to prevent any issues with bud rot.

20-30% in flowers is asking for PM (imo)

i use a 6" 440cfm exhaust fan and a 8" 420 cfm intake fan both on speed controllers.

i also noticed the fogger lowered my temps by 2*, its not much, but for those trying to lower their temps, it works. now next summer im gonna try to put a few frozen 20oz pop bottles in the fogger tank and see if my temps lower even more.

DemonTrich said:

since I grow underground, I don't worry whats happening with temps outside. my underground temps are pretty stable year round. iirc, my flower r/h is between 50-65%, occasionally dipping into the high 40's. I only run the fogger in the veg room. i run it 5hrs on, 45m off, 5hrs on, 45m off, back on and turn off 2hrs before lights out. and i still, keep 68% lights off until lights on. flower i really don't bother too much with r/h, i like it on the low side to prevent any issues with bud rot.

20-30% in flowers is asking for PM (imo)

i use a 6" 440cfm exhaust fan and a 8" 420 cfm intake fan both on speed controllers.

i also noticed the fogger lowered my temps by 2*, its not much, but for those trying to lower their temps, it works. now next summer im gonna try to put a few frozen 20oz pop bottles in the fogger tank and see if my temps lower even more.

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20-30% rh asking for pm? What would you say is acceptable then, in your opinion? I freak out and usually kill the entire plant if I see the dreaded PM. It's literally plant EBOLA. It spreads like wildfire. Would you say to drop it even lower? like 10-15%?

anything below 40% (at the very least 35%) is asking for PM issues, imo and countless others on various mj grow forums. but anything that low and your now allowing the plant to thrive and grow properly. see the VDP chart that's been popping up on quite a few threads as of lately.

DemonTrich said:

anything below 40% (at the very least 35%) is asking for PM issues, imo and countless others on various mj grow forums. but anything that low and your now allowing the plant to thrive and grow properly. see the VDP chart that's been popping up on quite a few threads as of lately.

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I understand now LOL. Thanks so much again for all your help. If I ever meet you one day, you will be paid or rewarded handsomely.

Here's some pics of the babies/current semi-wonky setup. Still under t5s. Added an eye hortilux t5 UVA/UVB bulb today (just one stand-alone four foot) because they were outgrowing their t5s after placing them into 5 gallon smart pots. Did some LST also last night. I also hear UV can help kill mold spores. 0 signs yet (knock on wood) of any WPM.

Lows are around 62 at night, and 78 high during the hottest part of the day. I will probably flower sometime next week. Humidity is staying around 40% low and 50% high (i know this is a bit low, but still in the lower range of the VDP chart). Intake is on about 20% and exhaust is on about 33%.

Thanks again, buddy, and happy growing!

just pay it forward to the next guy who needs help. im about to start main lining and I have a very slight idea of how to do it. so I asked someone whos been doing it and knows wtf their doing. its all about being part of a growing community. people helping others obtain the same goal, quality flowers, great grows, and happy farmers..

You guys think I should start flowering in about a week?

I ordered real hoods; the Apollos weren't cutting it. I tried tweaking them, but I gave up. Too much whistling at high CFM. I tried asking if they would SELL the neoprene crap they seal the hoods with (on one end, vs all four like the two Sun System Blockbuster 6 inches). No response from them. Temps got into the 84 degree region. I would much rather it cooler.

Just go buy the neoprene seal from home depot. It's nothing special. Cheap there too

84 in veg is perfect

on all 4 of my big kahuna hoods and soon a 5th, I used weather strip to seal the hinged glass hood and I also caulked ALL the seams and any other leak points on the hood.

all of my hoods are perfectly sealed and work great. also, just read wrap your duct work with saran wrap to seal any pi holes in the ducting.

Getgrowingson said:

Just go buy the neoprene seal from home depot. It's nothing special. Cheap there too

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Thanks for this advice. I wasn't sure if they sold it or not. I'm going to doctor those apollo hoods up with neoprene from Home Depot and use them for my other ballasts with no hoods in another tent.

DemonTrich said:

84 in veg is perfect

on all 4 of my big kahuna hoods and soon a 5th, I used weather strip to seal the hinged glass hood and I also caulked ALL the seams and any other leak points on the hood.

all of my hoods are perfectly sealed and work great. also, just read wrap your duct work with saran wrap to seal any pi holes in the ducting.

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I was contemplating caulking my hoods, but was a little worried with the temperatures and it possibly melting the caulk. I'm guessing there are heat-tolerant forms of caulk at your local Home Depot though? Any particular brand you might recommend?

dunno, the caulk was 11.95 a tube. 30 min rain/weather ready 100% silicone. same stuff I use to seal windows, bathroom, ect. ive had my hoods for 2 yrs now and caulk is still holding strong.

GE maybe,.