Night temp at 87 deg in sealed room?

[Mr. Smithh]

So I have a sealed room... running co2 using a split mini ac ...so no

exhausting.......My dehumidifier runs most of the night and the night

temps are like 87-88 feels more like 90....I run my day temps with

the co2 between 85-88.. I remember reading a high times article

years back saying that plants release some type of beneficial

hormone when the night time temps are kept 5 degrees hotter

than daytime temps..I'm sure thats not pratical for most people

but my dehumidifier keeps the temp high.. Do plants require cool

temps at night....? Any info would be much appreciated...thank

you very much.

 

[Mr. Smithh]

I know my question sounds confusing....Would I really meant to ask is ....Is 88 degrees too hot for night temps?? Do I need to run my mini split at night to keep the temps down??..Thank you.

 

[Lammy]

I shoot for a canopy temperature of about 83 with co2 during lights on. I wouldn't personally go any higher than that and I wouldn't put any faith in anything you read in high times. I would think that ideally you would want the canopy temperature to drop about 5 to 10 degrees in the night time.

 

[Bonavendura]

i have the exact same problem and i am searching a solution so i can drop the temps 5 or 10 degrees at night.For now i keep the A/C running 24/7 and i think you should too.

 

[Granger2]

Your day temps and night temps are quite a bit too high. Turn the mini-split on 24-7, and set thermostat wherever you need to to get the temps down to where they should be. Buy a High/Low temp and humidity thermometer/hygrometer. Good luck. -granger

 

[PrivateAero]

Color comes out with cool night temps. There was something in the scientific section about raising temp at night for first week of flower to reduce internode spacing. See if you can find it, that's all I remember.

Privateaero

 

[Lammy]

spurr wrote about temperature differential controlling stretch.

 

[MIway]

'the dif'... u can look up poinsettias & manipulating temps... higher night temps vs day encourages less stretch & more closely stacked nodes. will it keep a stretching plant og under control...? not that i have experienced, so just to keep it real.

but, botrytis is significantly hindered in germinating & spreading as one approaches mid-80's... and ones rh is significantly reduced as well. on the flip side, plants transpire much more & sensitive to nutes.

good & bad, just as anything.

 

[Mr. Smithh]

So my temp stays at 84-85 during day and 87-90 at night..so I have a constant -5 DIF..the plants seem to be handling it fine...I don't think running split ac 24hrs is economically viable..thinking of installing exhaust fans with filters to keep night time temps cooler....was wondering if anyone has ran a -5 DIF throughout entire flowering cycle?

 

[Green_science]

Be careful running a negative DIF you WILL get chlorosis eventually.
DIF is used, and is the most effective method (excluding PGR), throughout the horticultural world to control stem elongation and is effective in many many plants including canna.

 

[machead]

Be careful running a negative DIF you WILL get chlorosis eventually.
DIF is used, and is the most effective method (excluding PGR), throughout the horticultural world to control stem elongation and is effective in many many plants including canna.

What's chlorosis as I thought neg pressure was good for smell

 

[Born Loser]

What's chlorosis as I thought neg pressure was good for smell

hes talking about neg temp differential, not neg air pressure.
warmer nights vs days = neg temp dif

 

[anon0988]

It's been mentioned already but yeah, there was some scientific work done that indicated when the night temp goes up by like 5-10 degrees it would shorten the length between nodes. I don't think it went into which temps were right for what plants, but it was generally shown that higher lights off temps create bushier plants.

 

[nukklehead]

FWIW my partners buds are very airy and yield goes down in the summer time for his inability to drop his night time temps imo..
same strain, setup etc.... Might get flamed for imo but in nature it usually gets cooler at night and warmer in the day...

 

[noyd666]

I don't have c02, but my dehumidifier throws out to much heat for a very tight sealed room. it vents heat out top right hand side, so I slightly modified a plastic toy box that the dehum sits under, with ducting and can back draught shutter damper, so heat just draws up and into next room. or if I need heat ,just pull back dehumidifier and let it into room proper, or half and half, comes in handy as adjust heater. might be ok at night without the co2.

 

[Lammy]

noyd.
the hot air coming out of your dehumidifier is the dry air. that's how they work.
I know it seems like cheating.

 

[noyd666]

bugger it was working perfect