Humidity droping to 90% at night
- Thread starter Mike7
- Start date
darkdestruction420
Well-Known Member
keep the fans going all the time.
Then my temperature drops to like 52 degrees though
Cool, so do you guys think i should maybe get a space heater at night to keep the temp above 60É
darkdestruction420
Well-Known Member
Wouldnt hurt.
Steadmanclan
Well-Known Member
that much humidity will cause problems.
i agree, leave the fans on. your buds may turn a little purple if the nights are in the low 50's, but last time i checked, purple buds are better than moldy ones.
i agree, leave the fans on. your buds may turn a little purple if the nights are in the low 50's, but last time i checked, purple buds are better than moldy ones.
Lol I know tons of people that will pay extra for purple buds
darkdestruction420
Well-Known Member
Not to mention the fact that alot of places get down to that or lower at night outside and people grow just fine. my girls brave those and lower temps very often the last month or so of flowering and i havent had any problems ever cept if its gonna be a heavy-mild frost you gotta bring em inside overnight cuz they cant take more than 1 or 2 heavy frosts.
original poster-
Despite that fact my advice remains the same as before, airflow is very important, especially during flower.
Danthebull
Well-Known Member
Hi mate. i had the same problem when i started my grow. Not realising why this was, i did some research to fix the problem... Here is what i found out and what it was being caused by and fixing the problem. So i hope this help's you as it did with me.
Firstly when your lights are on the heat generated by them will dry the air in the grow space keeping the humidity lower. At night cycle the heat is no longer in abundance so the humidity is not being dried and will stay at a lower level in the grow room. Thus causing buds to rot or on early plant leaf mold. Now i had a couple of fans going at night and a 6" carbon filter. This should have meant that my humidity should have stableised within the room but as the grow went on the humidity became even higher. I started scratching my head again and to look for an alternative solution to lowering the humidity, so i went and got a dehumidifier at a pricely cost. Now me being me. I knew that this would do the job. I put it in the room at night and hey presto it sucked moisture from the room. But somthing still didn't seem right as it only lowered it by 10% ish and for the next few days i monitored the humidity.
After a few days. I started thinking that it was somthing else and to start checking the equipment that i have. This is what i found was the problem.
After checking all fans were working properly i started to check the ducting that was fixed to the exhaust and found that the condensation had built up so much in side the duct that it had created a pool of water inside, this was stopping the humidity exiting the room. So what i did was to drain the ducting, re-fix it with less bends and to get a pin and prick some tiny holes in it where the condensation may collect, so that if water drops do form and collect then they have somewhere to get out from. I put a few towels under this so i could test this method and it worked...
I took out the dehumidifier at night and tested the room and it was bang on perfect on the first test. So if your using ducting it may be wise to just give it a little check to see if there is a build up of liquid...
Sorry this was a bit of a read for you but if there is anything in there that may help you then your good to try it......
Dan
Firstly when your lights are on the heat generated by them will dry the air in the grow space keeping the humidity lower. At night cycle the heat is no longer in abundance so the humidity is not being dried and will stay at a lower level in the grow room. Thus causing buds to rot or on early plant leaf mold. Now i had a couple of fans going at night and a 6" carbon filter. This should have meant that my humidity should have stableised within the room but as the grow went on the humidity became even higher. I started scratching my head again and to look for an alternative solution to lowering the humidity, so i went and got a dehumidifier at a pricely cost. Now me being me. I knew that this would do the job. I put it in the room at night and hey presto it sucked moisture from the room. But somthing still didn't seem right as it only lowered it by 10% ish and for the next few days i monitored the humidity.
After a few days. I started thinking that it was somthing else and to start checking the equipment that i have. This is what i found was the problem.
After checking all fans were working properly i started to check the ducting that was fixed to the exhaust and found that the condensation had built up so much in side the duct that it had created a pool of water inside, this was stopping the humidity exiting the room. So what i did was to drain the ducting, re-fix it with less bends and to get a pin and prick some tiny holes in it where the condensation may collect, so that if water drops do form and collect then they have somewhere to get out from. I put a few towels under this so i could test this method and it worked...
I took out the dehumidifier at night and tested the room and it was bang on perfect on the first test. So if your using ducting it may be wise to just give it a little check to see if there is a build up of liquid...
Sorry this was a bit of a read for you but if there is anything in there that may help you then your good to try it......
Dan
Good advice, i checked into that and everything was fine.
I've only got like 90 sqf, and the guy at a hydro store said i needed this 392 cfm fan, when in realityI am told you need an exhaust that empties your room every 5 minutes, not 15 seconds lol. Is it possible that my low humidity is due to my extremely strong exhaust? Perhaps I should change my timer on my exhaust so it runs on 45, off 15, to allow the humidity to rebound a bit, and then maybe have it run 15 minutes every hour at night time so that it lowers my humidity to a nicer range.
what do you think?
I've only got like 90 sqf, and the guy at a hydro store said i needed this 392 cfm fan, when in realityI am told you need an exhaust that empties your room every 5 minutes, not 15 seconds lol. Is it possible that my low humidity is due to my extremely strong exhaust? Perhaps I should change my timer on my exhaust so it runs on 45, off 15, to allow the humidity to rebound a bit, and then maybe have it run 15 minutes every hour at night time so that it lowers my humidity to a nicer range.
what do you think?
Danthebull
Well-Known Member
I think you should be running your exhaust all the time. You need to create negative pressure in the room. This means more air going out than coming in. The exhaust pulls hot moist air out and this help's to lower humidity. If you have positive pressure, then the hot sticky moist air will stay in the room and thus could be the problem.
Give me the low down of your room and if you can add some pics and we'll see if we can get this problem sorted out for ya...
Dan
Give me the low down of your room and if you can add some pics and we'll see if we can get this problem sorted out for ya...
Dan
Here's a link to my journal, it's pretty basic so far.
I think I know what my problem is then... What do you think of this, since i clearly have a super powerful exhaust, then using my above schedule should even out the humidity. Ideas?
https://www.rollitup.org/grow-journals/336341-my-first-grow-2x400w-2-a.html
I think I know what my problem is then... What do you think of this, since i clearly have a super powerful exhaust, then using my above schedule should even out the humidity. Ideas?
https://www.rollitup.org/grow-journals/336341-my-first-grow-2x400w-2-a.html