humidity in room?..

Moose71

Active Member
i got a 4' by 5' by 7' grow room in my 10'by 12' spare bedroom. don't have the option to vent outside as its so cold up here. if i vent thru a carbon filter with my fan blowing used air from the grow tent into the bedroom ,would i have a issue with excess humidity? its pretty dry humidity wise in winter up here. anyone have humidity issues doing the same? at -30f opening windows isn't a option. got 4 plants started in there.
 

jay5coat

Well-Known Member
I am doing the same thing, humidity is a little high sometimes but I can crack the window in the room this time of year(live in the desert). Best bet would be to buy a dehumidifier for the room your venting into to keep it down. I'm probably going to have to do the same when summer hits(and I can't crack the window). Also depending on what your growing in (soil, coco/ hydro) it might be lower or higher. I'm running coco this time and watering 2x a day so it's more humidity than I'm used to.
 

ruwtz

Well-Known Member
IME I would say its more critical to maintain temps and humidity within range, doing everything to avoid swings or wild changes in either direction, rather than aiming for specific numbers.

We're growing a weed here, it is highly pervasive, and will grow in just about every environment so long as its predictable. You will find people running low humidity/low temps, and people running the total opposite, both getting excellent results every time and swearing by it.

Proof if you need it of this plants' adaptive nature.

Remember also that humidity and temperature are symbiotic factors in your environment; they cannot be thought of separately.

As long as humidity isn't crazy high and stifling transpiration or encouraging mold, or so low that they transpire too fast (drinking heavy, taking on excess nutes etc), you should do everything else to keep it steady.

If you're fighting really high humidity then you have no choice but to dehumidify.
 

Moose71

Active Member
thanks for the info. i may need to get a dehumidifier but for know its ok in there. 75f at 65% hum. its when they're bigger that worries me. never grew something this big in the house before.
 

jijiandfarmgang

Well-Known Member
If you have that small of a grow in a home, and its that cold outside, the RH is probably low in your home. Just recirculate air.

65 is on the high side depending on stage of plants, and think about how RH behaves.

If lights turn off and temp drops, RH will jump up a lot.

- Jiji
 

Moose71

Active Member
usually do have very low rh in winter but with 4 plants in there I'm just worried it will be too much. I'm using leds so temp shouldn't be a problem. hopefully if it stays on the cool side humidity won't be such a problem. thanks for the input!
 

thumper60

Well-Known Member
usually do have very low rh in winter but with 4 plants in there I'm just worried it will be too much. I'm using leds so temp shouldn't be a problem. hopefully if it stays on the cool side humidity won't be such a problem. thanks for the input!
go get your self a small dehuie u will have mold in that room before u no it
 

r.i.kid

Well-Known Member
thanks for the info. i may need to get a dehumidifier but for know its ok in there. 75f at 65% hum. its when they're bigger that worries me. never grew something this big in the house before.
are you using a hps hid?
 

r.i.kid

Well-Known Member
usually do have very low rh in winter but with 4 plants in there I'm just worried it will be too much. I'm using leds so temp shouldn't be a problem. hopefully if it stays on the cool side humidity won't be such a problem. thanks for the input!
if you were to use a hps it'll fix that rh
 

Moose71

Active Member
go get your self a small dehuie u will have mold in that room before u no it
I knew a fellow maniac would see my situation! I'm in a old trailer to so you know how well there insulated! Plus I'm up in St. John valley! It's my first time grow indoors. I knew I'd probably come into a sweat problem. Thanks!
 
Last edited:

thumper60

Well-Known Member
I knew a fellow maniac would see my situation! I'm in a old trailer to so you know how well there insulated! Plus I'm up in St. John valley! It's time grow indoors. I knew I'd probably come into a sweat problem. Thanks!
always gald to help northern brother,dont bring that cold air into ya room need a lung room up here,:bigjoint:
 

Moose71

Active Member
If you have that small of a grow in a home, and its that cold outside, the RH is probably low in your home. Just recirculate air.

65 is on the high side depending on stage of plants, and think about how RH behaves.

If lights turn off and temp drops, RH will jump up a lot.

- Jiji
I'm running 24 hr lights as I'm growing autos. got a exhaust fan on a regulator and a rotating fan inside. they're in seedling stage in 5 gal airpots. started them in their final pots as I've read that autos get stunted by switching pots. probably why i have such hi humidity. should i start running the fans in there now or wait till the seedlings get a little bigger? they're about 2in. now just starting to grow their true leaves.
 
Last edited:

r.i.kid

Well-Known Member
I'm running 24 lights as I'm growing autos. got a exhaust fan on a regulator and a rotating fan inside. they're in seedling stage in 5 gal airpots. started them in their final pots as I've read that autos get stunted by switching pots. probably why i have such hi humidity. should i start running the fans in there now or wait till the seedlings get a little bigger? they're about 2in. now just starting to grow their true leaves.
air is always good
 

goldenbigboi

New Member
E="jijiandfarmgang, post: 13191353, member: 424199"]If you have that small of a grow in a home, and its that cold outside, the RH is probably low in your home. Just recirculate air.

65 is on the high side depending on stage of plants, and think about how RH behaves.

If lights turn off and temp drops, RH will jump up a lot.

- Jiji[/QUOTE]
Whats the ideal temp and humidity level for veg plants
 

jijiandfarmgang

Well-Known Member
E="jijiandfarmgang, post: 13191353, member: 424199"]If you have that small of a grow in a home, and its that cold outside, the RH is probably low in your home. Just recirculate air.

65 is on the high side depending on stage of plants, and think about how RH behaves.

If lights turn off and temp drops, RH will jump up a lot.

- Jiji
Whats the ideal temp and humidity level for veg plants[/QUOTE]

Theres so many variables theres probably no ideal. They do seem to do better above 50 percent humidity in veg.

Too high humidity and you have to worry about mold in your grow spot, and PM. Usually thats above 70 percent. Bunch of variables once again.

- Jiji
 

Moose71

Active Member
got vent fan and occilating fan on low and rh is down to 55%. their 1st true leaves are an inch long now. were starting to stretch so i put them about 3ft. below my 1200 w king led. i hope i don't burn them. according to directions, min. distance to plants is 1.7ft. so i should be good to go. thanks again for the info. got 1 bean didn't take so I'm replanting with another strain of auto.
 

thumper60

Well-Known Member
got vent fan and occilating fan on low and rh is down to 55%. their 1st true leaves are an inch long now. were starting to stretch so i put them about 3ft. below my 1200 w king led. i hope i don't burn them. according to directions, min. distance to plants is 1.7ft. so i should be good to go. thanks again for the info. got 1 bean didn't take so I'm replanting with another strain of auto.
55% in veg is nice,just go easy on everyting give them plants a chance to kick in takem couple weeks to put they feet down
 
Top