Slight Chill in room

raggyb

Well-Known Member
There is a slight chill in the room, aroud 71 F is the high. Would it be better to turn the circulating fan off? There are still in and out fans on. rH around 55%. Plants in flower. Thanks if you know!
 

spliffendz

Well-Known Member
I used to have a fan controller variac thing to slow/speed outtake in emergencies, also a heater on thermostat plug
 

raggyb

Well-Known Member
I used to have a fan controller variac thing to slow/speed outtake in emergencies, also a heater on thermostat plug
I should add I'm not ready to put a space heater in there yet. And I accedentaly said circulating fan. More correctly it's an oscillating fan, that's blowing over the canopy that I am thinking of turning off.
 

raggyb

Well-Known Member
Is your air coming from outside? There are a few things you can do
Air is just coming from another room but heat is not on. So the oscillating fan is just blowing air around not in or out of the room, and it's directly on the plants. The in and out fans don't blow directly on the plants. I'm thinking they don't need the wind on them when it's a little chilly.
 

WintersBones

Well-Known Member
what's the low? that's an ok temp to be at in flower if it doesn't drift too low. I'd rather have it little cooler with air circulation, than a degree warmer with no air moving... the fan wouldn't be cooling the room much at all anyways, just moves the air around.
 

Renfro

Well-Known Member
There is a slight chill in the room, aroud 71 F is the high. Would it be better to turn the circulating fan off? There are still in and out fans on. rH around 55%. Plants in flower. Thanks if you know!
What light source? If using LED these cool temps will kill growth rates and yields.

With cool temps RH% can become more of an issue as the air holds less water causing RH% numbers to be higher with the same amount of moisture in the air, and is harder to dehumidify.
 

raggyb

Well-Known Member
what's the low? that's an ok temp to be at in flower if it doesn't drift too low. I'd rather have it little cooler with air circulation, than a degree warmer with no air moving... the fan wouldn't be cooling the room much at all anyways, just moves the air around.
low so far is about 68F. so that's kind of perfect right? it's probably a litttle hotter under the lights too so maybe i shouldn't worry.
 

raggyb

Well-Known Member
What light source? If using LED these cool temps will kill growth rates and yields.

With cool temps RH% can become more of an issue as the air holds less water causing RH% numbers to be higher with the same amount of moisture in the air, and is harder to dehumidify.
they're HID's. I leave the input fan on because the dehuey is in the room it pulls from. I might set the dehuey a little lower too since yeah, it seems to be having less effect. i didn't realize that's probably why!
 

raggyb

Well-Known Member
I would want those temps up around 78-79 probably, what types of HID? Wattage? HPS, MH, CMH?
older non-digital 400W MH and HPS with ballast attached so they're generating some heat. oscillator moves that heat off the canopy somewhat. it's a bit of wackamole because if i fix day temps it will mess up night temps and vice versa. for now i want to get to on average the best levels i can, knowing that it won't be perfect but for now the best i can get with what i got. i hesitate to turn on the heaters as it's going to warm up again for a while plus the heaters generate light and that's a whole thing i don't have time to fix right now.
 

raggyb

Well-Known Member
I would want those temps up around 78-79 probably, what types of HID? Wattage? HPS, MH, CMH?
yep, tried a few things but got down to 65/48% low, 71/52% high. Would like the colder night to get some color but not getting enough heat on the high end right now. Back to looking at more space heat control. I guess maybe it could pay for itself. Also gives me a new question of just how bad would constant 76F day and night be?
 

Renfro

Well-Known Member
Also gives me a new question of just how bad would constant 76F day and night be?
Better than this cold stuff. It kills yield by slowing the metabolism. You want warmer leaf surface temps when the lights are on. Cold plants equals slow growth and reduced yields. Cool nights give purps because of limited phosphorous uptake due to cool roots, also hurting yield. It's ok to do that during ripening, like the last 10 days or so but do it too early and it's hurting yields.
 

raggyb

Well-Known Member
Better than this cold stuff. It kills yield by slowing the metabolism. You want warmer leaf surface temps when the lights are on. Cold plants equals slow growth and reduced yields. Cool nights give purps because of limited phosphorous uptake due to cool roots, also hurting yield. It's ok to do that during ripening, like the last 10 days or so but do it too early and it's hurting yields.
I better get on it then. Found a heater I have that doesn't seem to make light so I'll try that. Thanks.
 

raggyb

Well-Known Member
I better get on it then. Found a heater I have that doesn't seem to make light so I'll try that. Thanks.
I tried 2 more things.

With heater in and dehu out and intake fan on I got low 69/55% and high 78/58%. Dehuey working hard for little result but I liked the temps. Heater probably burning tones of E. I forgot to check. But it uses 35W when off!

So against my inclination I moved the dehu in. It gives me much better rH result at 50% constant, but heat is 75 low and 81 high. I will put intake fan back on and see if it helps or hurts.

Week 7 and I want rH down to 50% if I can get it. Seems like the dehuey in seems like the better deal.
 

SnidleyBluntash

Well-Known Member
Point your fan at your light and blow downwards, exhaust the air from the bottom of the tent, play with the speed until it’s nice and warm
 

raggyb

Well-Known Member
Point your fan at your light and blow downwards, exhaust the air from the bottom of the tent, play with the speed until it’s nice and warm
It's not a tent so lots of air leaks but I gotcha. I more or less point the circ fan at the lights. My exhaust is already at the top because usually too hot is my problem. Already playing with fire (old lady) cutting holes in the wall, so I gotta think i won't cut another hole. I'm going to try blowing air in from the other room (hole already there) which may make the dehuey work harder again but it would be a little cooler. Wish the can fans were better. I think an aftermarket speed dial fucked up my can fan and I took it off and now that fan takes 24 hours to come up to speed.
 
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