Humidity issues

[Greenpassion]

As soon as I think I've got the environmental control thing down, the weather changes. So here in Vermont things are in the mid-forties lower 50s. My rooms upstairs or at least the one grow room that I've been using so far possibly has too many lights in it? I'm struggling with bringing cool air from the outside in, keeping it warm enough in there, keeping it cool enough in there, and keeping it humid enough in there. Right now the humidity up there is 37 degrees Fahrenheit. I have 5 week old seedlings, along with 2 month old photos, along with four soon to be harvested autos. So in reading the tutorials 37 is way too low. But I'm getting a feeling that the amount of grow lights I have up there could be the issue? Or could it be I have too much fan movement? So I need a large room humidifier, a small little for in fresh air Inlet fan, and in Spring I will need air conditioners, this is crazy making trying to control this environment. I'm going to attach a picture of the seedlings there about 12 days old. They are autos. And just from having grown the last month or so, I know that they should be bigger than this at 12 days shouldn't they? And is this because of the humidity or Temps?

[SinsemillaScientist]

I would get fan speed controls off amazon and do some adjusting on intake and outake. Try and find a sweet spot where your temperature is sitting steady, if that doesnt help get a oil heater they produce no light, usually have adjustable setting, and they arent too hard on an electric bill. And not to sound pushy but I would hurry because 37 is detrimental to plant health anything below 55 is a danger zone for instant death, some strains handle cold better like indicas and reluderalis(autos) because they come from temperate to cold regions. But temperatures like that will halt growth, all but stop a budding plant, and may cause weird symptoms even if everything else is under control. Then i would try and stabalize humidity because it will become variable with your temperature and other parameters such as plant size, weather, water intake etc...etc .. Good luck and happy growing friend!

[Flockshot]

In Michigan, I time my grows so that I do not grow in August, due to the humidity. Also, February is a month that I avoid if I can.
If you are committed to growing year round, then you will be investing in some good equipment and poring the electricity to it.

[Weed Pharma]

Low humidity is not really a concern, once the plant has taken root- here is a January grow: https://forum.growweedeasy.com/forum...ies-autoflower

Temperature however is- do what ever you have to get within 65-80f. Low temperature slows/stops growth.

Some suggestions-
Move lights closer to the canopy.
Stop bringing cold air from the outside. (inside air (oocupied rooms) have more CO2 anyways)
Reduce the ventilation.
Lights on 24 hrs - once only auto's (vegging photo's)

[D.A.A.S.69]

Greenpassion, You might want to get some heat mats for your seedlings, they helped me a bunch last year, you got to keep those roots warm,
Yeah they should be a little larger, for 12days, but they should take off in a few days if you keep them warm.
In a big room like that I'd have me a couple of tents, if I could afford them, makes it alot easier to control the heat.
Keep them warm, the young ones, I wouldn't worry much about the ones your fix in to harvest.

[Greenpassion]

D.A.A.S.69, I'm not sure but I think that since I'm having trouble with so many LED lights in this room I won't need heat mats through the whole grow. This will be my second and third grow, and I've only used heat mats to sprout the seeds. I did what you suggested months back and I put them up off of the table on plant coasters. So there's air circulating underneath the cloth pots. So I don't know how I could use heat mats anyway. Just got to tell you how much I appreciate your quick responses and your advice. Your input and advise encourage me to keep going.

[Greenpassion]

Do you live in a southern area? I'm curious if humidity is not a problem but neither would warrants be. What are your winters like? That you would need heat mats?

[D.A.A.S.69]

Greenpassion, we live in the MagnoliaState, on the river.
Last year it got cold as hell, it snowed 6inches deep, an the ground stayed froze for over a week.And them mats came in handy on some young seedlings.
Normally we get about 3 light frosts a year. It ain't never cold down here, for long.

[Greenpassion]

And I know that I posted the other day about how the room was cold, and that was because the room across the hall with the door open had an air conditioner blowing cool air into this grow room. This room I'm speaking of will be the flowering room and I've just hung the lights and I'm working on the other parts of it that need to be done. But the point is is that I need to create two separate enclosed environments. The room across the hall will be the 12 12 room, and the room that I am currently in is for all of my auto and my photos in veg.

[KTM690]

I'm also a vermonter green. In winter time I use a small fan that can also heat think I found it at Wal-Mart I set it up blowing warm air in tent when needed. But I use a tent so its super easy to control

[Greenpassion]

Wow D.A.A.S.69, I am envious of your Winters! Last year we had weeks and weeks of below zero weather, and so much snow and ice that my plow bill for my driveway alone was over $500. The older I get the less interested I am and staying here, but unfortunately I work at the same place for 21 years, and my daughter is buried on my property. So I'm here to stay. Eventually I'm hoping I'll get this environmental control situation down pat. It was so much easier with my orchids that are all on the first floor of the house. And being as these are all growing in two rooms, not tents, it might be a little more challenging I think. I really need to get insulation up there better than it is. And once again I continue to thank you guys for your responses and ideas.

[Greenpassion]

I did pick up 2 oil-filled heaters to put up there, one in each room , and that will probably happen within the next week or so. Right now I can keep that room at around 75 which is great, but my humidity is only 37. And if I have the door to that room closed with all those lights the temps sore to above 80. So then when lights go out for 6 hours, the temps dip into the lower 70s. Is that too much fluctuation?

[Weed Pharma]

That temperature difference is perfect!
I grow plants as low as 17rh, in the winter- the plants make up for it in the amount of water they drink- just be mindful they are also taking up more nutrients, too.

[Greenpassion]

Well that's a relief to know Weed Pharma!