Day night temps FLAT - is it a problem?? (Flower)

[georgebush]

Currently in week 3 of flower with 2 rooms on a flip, 15 15gallon pots in each with 12K lights e/a. Sealed rooms, co2, quest dehus.

Question - Will i have negative effects of flat night time and daytime temps?

Day time temp slightly above canopy is 77-78 and once lights go off AC is used in other room B and room A ac is off. Since room is sealed and Dehu is on, temps stay steady. I have 1 vent coming from the AC from the lights on room (room with the AC ON) to the lights off room for some cooling effect. But it really doesn't do more than keep the temp flat especially because the hot air is stagnant and not being vented out.

Im maxed out on electricity so adding a 1 ton per room would be ideal but put me over the limit unless i start pulling lights and dimming.

Thoughts?

 

[Andyo]

which limit

which limit

Currently in week 3 of flower with 2 rooms on a flip, 15 15gallon pots in each with 12K lights e/a. Sealed rooms, co2, quest dehus.

Question - Will i have negative effects of flat night time and daytime temps?

Day time temp slightly above canopy is 77-78 and once lights go off AC is used in other room B and room A ac is off. Since room is sealed and Dehu is on, temps stay steady. I have 1 vent coming from the AC from the lights on room (room with the AC ON) to the lights off room for some cooling effect. But it really doesn't do more than keep the temp flat especially because the hot air is stagnant and not being vented out.

Im maxed out on electricity so adding a 1 ton per room would be ideal but put me over the limit unless i start pulling lights and dimming.

Thoughts?

The limit after your meter indoors or limit of outside incomin cable to your meter.A

 

[B4URTIME]

Currently in week 3 of flower with 2 rooms on a flip, 15 15gallon pots in each with 12K lights e/a. Sealed rooms, co2, quest dehus.

Question - Will i have negative effects of flat night time and daytime temps?

Day time temp slightly above canopy is 77-78 and once lights go off AC is used in other room B and room A ac is off. Since room is sealed and Dehu is on, temps stay steady. I have 1 vent coming from the AC from the lights on room (room with the AC ON) to the lights off room for some cooling effect. But it really doesn't do more than keep the temp flat especially because the hot air is stagnant and not being vented out.

Im maxed out on electricity so adding a 1 ton per room would be ideal but put me over the limit unless i start pulling lights and dimming.

Thoughts?

What size service? Are you running the ballast at 120v? I don't think the temp being flat will cause any significant issues, But ideally you would want a small drop after lights out.

This one vent you have connecting the rooms, Do you have an intake an return both because you would want to have an intake and return not just one active duct connecting the 2 rooms. If you have just one connection to push air from the cooled room to the lights off room, then you need to first add a return before you scratch the current setup or try to add more cooling.

 

[iffey]

I thought 'sealed room' ment 'sealed'.
and like b4urtime said if theres an inny hole there should be an outty hole or there will be no in air. without an exhaust there would be no room for any incoming air. seems to me that your temps for a sealed room are a little low if you were to raise you daytime temps to 85*F or so you'll have night time temp variations.


but sealed is supposed to be sealed.. many have done sealed rooms, none that I've seen had any night time temp variation concerns..

 

[RockinRobot]

Not having a temperature swing at night is actually one of the ways to help stop plants from stretching and will not hurt.

 

[georgebush]

The limit after your meter indoors or limit of outside incomin cable to your meter.A

I have 2 200AMP service inside, using 135AMPs on 1st panel and 86AMPS on 2nd panel. This is basically maxing out what the transformer outside my house can pull as it is a small 50 and I couldn't get DTE to upgrade.

 

[georgebush]

What size service? Are you running the ballast at 120v? I don't think the temp being flat will cause any significant issues, But ideally you would want a small drop after lights out.

This one vent you have connecting the rooms, Do you have an intake an return both because you would want to have an intake and return not just one active duct connecting the 2 rooms. If you have just one connection to push air from the cooled room to the lights off room, then you need to first add a return before you scratch the current setup or try to add more cooling.

Ballast are Gavita 6/750 on 240V.


So the the rooms are set up almost exactly them same one pipe coming from room A into room B from the air handler and vice versa. HVAC guy told me the not in use pipe would act as the return (I didn't understand this but didn't dispute it either)


SO basically there is a 6in pipe that is coming from the OFF room that is supposed to be acting as the return. This pipe goes to the air handler deck that has multiple vents in it. Its about 20FT long and is coming out of a 5TON air handler.


Hope this makes sense.


I was thinking of adding a 6in inline fan 440CFM to push the air into the room with lights off, and adding another inline fan on the so called return to draw hot air out of the off room. Would this help?

 

[georgebush]

Not having a temperature swing at night is actually one of the ways to help stop plants from stretching and will not hurt.

I have read many things suggestiong this but from my understanding it is not ideal to go the entire way through flower with flat temps or negative DIF.


Read a thread where someone had airy buds because he ran this way the entire way through.

 

[B4URTIME]

Ballast are Gavita 6/750 on 240V.


So the the rooms are set up almost exactly them same one pipe coming from room A into room B from the air handler and vice versa. HVAC guy told me the not in use pipe would act as the return (I didn't understand this but didn't dispute it either)


SO basically there is a 6in pipe that is coming from the OFF room that is supposed to be acting as the return. This pipe goes to the air handler deck that has multiple vents in it. Its about 20FT long and is coming out of a 5TON air handler.


Hope this makes sense.


I was thinking of adding a 6in inline fan 440CFM to push the air into the room with lights off, and adding another inline fan on the so called return to draw hot air out of the off room. Would this help?

If you decide to add an inline fan, I would add the fan to your off side in the upper corner of the room, and push the warm air into the on room where the air conditioner will cool it, I would install a 10" return duct on the opposite corner at the bottom of the room, that would create an optimal flow path for hot air to be pushed into the room actively cooled, and cool air will return via the 10" return duct.

If you could take a few pictures to give me a better perspective of what is going on. 6" doesn't sound like nearly a large enough return duct for a room that houses 12k in lights.

 

[B4URTIME]

I have read many things suggestiong this but from my understanding it is not ideal to go the entire way through flower with flat temps or negative DIF.


Read a thread where someone had airy buds because he ran this way the entire way through.

If you run higher temps, say 85f flat all the way through it could lead to airy nugs no doubt, but the op is running canopy temps of 78f which would mean his ambient temps are probably around 74 or 75. At this temperature running flat shouldn't produce any airy nugs.

However your right it isn't ideal to run flat!

 

[Ogtg2213]

Keeping day and night time temps as close as possible is what you want, no need to do anything. Lots of ppl run flip rooms for this very reason. I'd rather pay for lights then heaters and ac

 

[georgebush]

If you decide to add an inline fan, I would add the fan to your off side in the upper corner of the room, and push the warm air into the on room where the air conditioner will cool it, I would install a 10" return duct on the opposite corner at the bottom of the room, that would create an optimal flow path for hot air to be pushed into the room actively cooled, and cool air will return via the 10" return duct.

If you could take a few pictures to give me a better perspective of what is going on. 6" doesn't sound like nearly a large enough return duct for a room that houses 12k in lights.

I am going to do a test with existing ducting.


Add 6in inline to ON side pushing cold air to off side. Right now there is multiple bends in the pipe so it is not too strong on the exit end into the off room.


Add 6in inline in the ON room PULLING air through the air handler from the off room. This is the only way to accomplish this because when the room flips this will draw cold air instead of pull hot air..


Upon results I will adjust as needed. Rooms are adjacent for about 5FT so I could just put a hole in the wall and have 2 inline fans pointing in opposite directions in between the studs... But how would I contain the light?


Will get pics and a drawing of the layout soon.

 

[Andyo]

in line duct fans

in line duct fans

I am going to do a test with existing ducting.


Add 6in inline to ON side pushing cold air to off side. Right now there is multiple bends in the pipe so it is not too strong on the exit end into the off room.


Add 6in inline in the ON room PULLING air through the air handler from the off room. This is the only way to accomplish this because when the room flips this will draw cold air instead of pull hot air..


Upon results I will adjust as needed. Rooms are adjacent for about 5FT so I could just put a hole in the wall and have 2 inline fans pointing in opposite directions in between the studs... But how would I contain the light?


Will get pics and a drawing of the layout soon.

In line duct fans i used have never seen light coming through them.A

 

[iffey]

In line duct fans i used have never seen light coming through them.A

how could that be?
do you have a long run of ducting preceding it?

 

[Andyo]

no ducting

no ducting

how could that be?
do you have a long run of ducting preceding it?

no no ducting, i just thought back to the 12/12 back to back in and out inline fans in the rooms but not in the grow bay.

inline duct fan suckin from outside into veg room but not the grow bay

another extracting from the that veg room through the room cieling into flower room above in the walkway, big scroll fall extractin into loft

In 40 years ive never had hermies either ,but never used other peoples seed untill this last 3 years

i think the outside wall inline suckin had solid plastic liner from fan bolted to wall through cavity and flush with outerbrick so 12 inches duct
a faint amount of light if i stood in the room door shut lights off ,

Ive all ways had 6 inch diamond core bit for outer walls works on roof tiles and slate too.A
way less than moonlight.A