Optimal nighttime temps for Autos?

[Pistil_Pete]

I run a whole room humidifier in the grow room rather than inside the tents. 60% is a bit high, you could do with 50% especially with lower temps at night. Running a humidifier in a tent that actively exhaust is frustrating and starts to feel stupid.

Temps are fine so long as you don't have frequent large swings as they can cause issues.

50% is doable, that's basically what I ended up doing, I just brought the room humidifier in the room and it's right at 50% right now with the lights on and it's only been about an hour now, gonna monitor it til I go to bed.

 

[Death The Cultivator]

50% is doable, that's basically what I ended up doing, I just brought the room humidifier in the room and it's right at 50% right now with the lights on and it's only been about an hour now, gonna monitor it til I go to bed.

Enjoy

 

[Suki]

The only other problem I forsee is maintaining a 60% Humidity at both day and night cycle. I have a humidifier I run for the house, maybe invest in a smaller one to place directly in the tent. How have others raised the RH while growing autos inside during the winter months?

I'm not sure how old your plants are but humidity tends to go up as your volume of hydrated media goes up as well. Once you're giving everyone full waters humidity tends to jump up.

 

[Bill.de.Cat]

I'm not sure how old your plants are but humidity tends to go up as your volume of hydrated media goes up as well. Once you're giving everyone full waters humidity tends to jump up.

The only other problem I forsee is maintaining a 60% Humidity at both day and night cycle. I have a humidifier I run for the house, maybe invest in a smaller one to place directly in the tent. How have others raised the RH while growing autos inside during the winter months?

I just take a food saver plastic tub, make a little frame out of a wire coat hanger and drape a old washcloth over it. Put water in the tub and it wicks up the washcloth. place inside tent near air inlet. Evaporative humidifier.

 

[Ryno_nuggs]

The right humidity highly depends on what stage of growth you are at, and what temp your tent is.

If your tent is in a room that is not too big, a humidifier in the lung room is the easiest way to maintain your targeted temperature as mentioned above.

If you are in veg stage and you not have a need to have your exhaust running a lot, a bucket with a towel as Bill mentioned works great.

A 10 degree swing over night is pretty natural. Preferably 70-75 at night is where I aim for.

Look into VPD. I apologize for not have an example of a VDP chart to show you.. It shows the ideal range for temperature and humidity for the whole growth cycle. It is not a one number for all cycles is best. The hotter it is, the higher the humidity can be before it becomes a problem.

Sometimes it is easier for me to adjust temps to match up with the humidity am at, sometimes it is easier to adjust the humidity to the temps.

Good luck and nice to meet you. Ask away and questions, everyone likes to help!

 

[Pistil_Pete]

I'm only in Seedling stage now, just want to see what my tent is capable of to be prepared. Thanks for all the input, this place has been more than helpful!

 

[GreenBean]

 

[Suki]

I'm only in Seedling stage now, just want to see what my tent is capable of to be prepared. Thanks for all the input, this place has been more than helpful!

If you can get your environment stable with your exhaust fan at the lowest possible setting, it will give you room to turn it up as needed later on to bring temps and especially humidity down. The bigger the girls are and the more moist soil you have in your tent, the higher your humidity will climb.
I harvested three plants in 5gal pots from my tent on 10/9-10/10 and you can see where the humidity kinda tanked because 15 gallons of moist soil were removed from the tent, leaving just three seedlings in 1gal pots. You can also see how as the three girls in the 1gal pots started taking on more water at each feed/water, its holding the humidity at a higher level. I've now got two 5gal pots in there too, though I am not watering them to 100% yet since the girls in them were just transplanted to their final pots yesterday and the day before.

10/15 (first tent shot I have from after harvest)

Today

 

[Suki]

View attachment 1383288

Even easier than the chart, you can Google vpd calculator and just plug in your info. Charts like that are hard for me cause I'm strictly mobile and the text is too small for me to see well.

 

[Pistil_Pete]

If you can get your environment stable with your exhaust fan at the lowest possible setting, it will give you room to turn it up as needed later on to bring temps and especially humidity down. The bigger the girls are and the more moist soil you have in your tent, the higher your humidity will climb.
I harvested three plants in 5gal pots from my tent on 10/9-10/10 and you can see where the humidity kinda tanked because 15 gallons of moist soil were removed from the tent, leaving just three seedlings in 1gal pots. You can also see how as the three girls in the 1gal pots started taking on more water at each feed/water, its holding the humidity at a higher level. I've now got two 5gal pots in there too, though I am not watering them to 100% yet since the girls in them were just transplanted to their final pots yesterday and the day before.

10/15 (first tent shot I have from after harvest)
View attachment 1383297

Today
View attachment 1383298


View attachment 1383299

Great info, thanks!