humidity help please

[stinky]

am haveing humidity problems at night .

humidity is going up to 65%--75% at night but it is 50% during the day

have just installed an ac to help (may fix but not sure)

also have two fans moveing air around in room

 

PLEASE HELP AS I DONT WANT MOLD ON MY BUDS (BLOODY TROPICS)

[MaddCreek]

The only way to decrease humidity is to decrease the temperature of the air. With that said it can get really expensive to cool down your inside air and also maintain your heating setpoint of 78 degrees. If the outside air is at 60-70% you have no choice but to use mechanical cooling such as AC or a chiller in your room. If your outside air is 50% or less then you need to increase your supply air (intake) and exhaust air to the room. There are things that you can do to minimize the humidity in your room like making sure any standing water is outside your room. Each time you water, wait for 1/2 hr. and empty any trays under your plants. If you are in hydro get your resevoirs outside the room. In the end the humidity WILL get you in the form of mold, there's no stopping it at the humidity levels you are talking about. This is my first post ever, hope it helps.

Peace out - MaddCreek

[stinky]

thanks maddcreek

i am a/c'ing a grow room within a room and as the temps rise in the outer room my humidity is riseing in the growroom

think i need to exhust the outer room?

do u think this will help?

only set up a/c today so still tril and eror

[ijustdontcare]

but prob is with a/c u have to make sure it doesnt blow directly on ur plants some people have told me it kills them. also do u have a extraction outa the room/cab where u are growing?? sounds like ur not gettin enuff fresh air in.. Edited December 1, 2008 by ijustdontcare

[stinky]

grow room has no air in or out

just has a/c

temp and humidity at lights on is 27c and 50% humidity (fairly stable)

 

so why is my humidity going up at night?

 

should i exhust/intake air at night?

 

night time temps and humidity are lower at night outside !!!

 

ALL HELP AND IDEARS WELCOME OR IF MORE INFO IS NEEDED PLEASE ASK

 

a/c is about 1m above plants and is not blowing on plants

Edited December 2, 2008 by stinky

[ijustdontcare]

i would sugest venting at night tho seems like the light is the thing thats keeping the humidity down while its going and when it goes off picks right back up so might just be better to vent and check to see how its going.

[stinky]

thankyou ijustdontcare for advise very helpfull!!!!!!

 

 

have just taken a/c out of grow room wall and am now a/c"ing outer room (3rd move sick of moving it)

am now getting intake air from outer room for grow room and exhusting air to the roof

this seems to be working , but with higher temps....test will be tonight when light go"s off

only passive exhust air in roof tonight but will get another exhust fan for it tomorow

 

i have my fingers crossed

[drifter]

You could do a few other things.

 

1) get a dehumidifier- recomended.

2)Vent better at night.

3) make your own dehumifier device.- can be left inside grow room or above lights etc

How i would build it is to make it similar to a carbon scrubber except using silica bi carb soda or at worst dry rice

as the scrubbing material.

This will also onsorb some odours but mainly used for reducing humidity.

 

You can get silica based kitty litters, have the device switch on via a relay when humidity goes over what you want.

Off when it gets a fair way below what you want.

 

You can then dry out the silica, rice or bicarb soda in the oven and reuse.

[bufo marinus]

Good replies

Good airflow across/up through the budsites from a fan/s will do a good job at those low levels. Tropics should see above 90% humidity for lots of summer so it ain't even started yet

[Cyclone]

When are your lights on / off more importantly...