Temperature and Humidity problems

[daz_rad]

Hey guy, I struggle to keep the temperature down, during the day it has reached 36 degrees celcius during the night it is a steady 23 degrees celcius. The cooler and fans have little effect and I dont want my exhaust to suck air from the top of my room because my second biggest problem is keepng the humidity up, it is as low as 25% during the day and I can get it past 50% during the night. I am trying to get a steady 25 degrees celcius and 65% Humidity

Here is how I have set up, for those of you who may wish to learn, or those who may be able to help me diagnose the problems I have.

- I have six plants in a 5' X 6' room the walls are lined with "panda film".

- I use two 600W HPS globes with two high quility reflectors. I have the timers set to 18/6

- 45W wall mounted exhaust fan in the lower corner of the room with a 1.5m length of ducting on it that is on constantly. I also have a pedestal fan standing in the room facing up to curculate the air, this turns off when the lights go off.

- I use a Mistril water cooler/heater to raise the Humidity and cool the air, it seems to have little effect. I add OxyPlus (an oxidising agent and sanitiser) to the coolers water reserve.

- I use a 50 litre reservoir with an immersable pump to feed my plants, it is set on a timer to go on for 15 minutes every half an hour during the light period, and 15 minutes every hour during the dark period.

- I feed them with a concoction of, OxyPlus, Budlink, Fish oil and DutchFest A&B Nutrients at a rate of 1ml per litre and slowly raise the amount each week. (fish oil is 1 drop per 10 litres)

If anyone could help me with suggestions to my humidity and temperature problems that would be great, thanks.

[topsykrets]

you need to get that heat out of there!!!! 36c = 97f and that is way too hot! you want to be well under 36c even if you have to sacrifice the humidity level... your plants wont last long with high temps, but can survive with low humidity.


I dont know what kind of budget you are working with, but I would start with a air cooled reflector and a high cfm fan, this will dramatically lower temps in the room and not lower the relative humidity.

shoot for a temperature goal of 22c, but your plants can handle up to 28-29c but thats on the high end

my temps are at 27c and plants look healthy

[daz_rad]

Originally Posted by topsykrets

you need to get that heat out of there!!!! 36c = 97f and that is way too hot! you want to be well under 36c even if you have to sacrifice the humidity level... your plants wont last long with high temps, but can survive with low humidity.


I dont know what kind of budget you are working with, but I would start with a air cooled reflector and a high cfm fan, this will dramatically lower temps in the room and not lower the relative humidity.

shoot for a temperature goal of 22c, but your plants can handle up to 28-29c but thats on the high end

my temps are at 27c and plants look healthy

Yeah tell me about it... this isn't my first crop, just the first time in this kind of room and not this large of a room either.

I usualye go for 28C with lights on and 22C with lights off, I am for 65% during grow and 45% during bloom. I just spent about $3500 setting it all up, so I am over my budget already but willing to spend in order to fix. I was told on another thread when I asked about the same problem to get a Humidifier... so I am looking into that now.

my reflectors are massive and it is really hard to attach ducting to them. I also use a MISTRIL air cooler for humidity and temp but its shit.

I know I need a new fan, my exhaust moves 600CFH and my intake is half that... but my room has plenty of cracks. Do I need a powerful fan for intake and exhaust? or just exhaust?

[topsykrets]

I would get something in the cfm range not cfh range. I only have one fan linking 4 reflectors and its a 425 cfm fan running at full speed, its pretty good at keeping the room cool, next fan I by will be 700cfm+ you wont need an intake and exhaust on a room that size. imo

I have a humidifier in my room and never turned it on, but had to take it out because it evaporated too quickly and my humidity reached 76%..... personaly I would rather be at 20% then 76%

I know what you mean about budget, I was aiming for $5,ooo that turned into $6300 now i need about another $700 to finish. I could have saved about $1000 if I would have done a little more research on what I truely wanted. like air cooled reflectors. I have 8 lamps and bought 8 reflectors and now need 8 air cooled reflectors.

[daz_rad]

Originally Posted by topsykrets

I would get something in the cfm range not cfh range. I only have one fan linking 4 reflectors and its a 425 cfm fan running at full speed, its pretty good at keeping the room cool, next fan I by will be 700cfm+ you wont need an intake and exhaust on a room that size. imo

I have a humidifier in my room and never turned it on, but had to take it out because it evaporated too quickly and my humidity reached 76%..... personaly I would rather be at 20% then 76%

I know what you mean about budget, I was aiming for $5,ooo that turned into $6300 now i need about another $700 to finish. I could have saved about $1000 if I would have done a little more research on what I truely wanted. like air cooled reflectors. I have 8 lamps and bought 8 reflectors and now need 8 air cooled reflectors.

Tahnks bud. I couldn't find anything in CFM range, in my country it all seems to be CFH, although I have the eqausions to work it out in FCM and some of the ones I looked at are up to 4000 CFH. But ill take your work for it and avoid intake.

small problem, I use curtains not walls, the walls are sucking in with my new fan!

I either need a humidifier or a better quality cooler i think, Humidifiers are expensive for what they are and coolers are about $500+ for a good one.

yeah my light shades arn't air cooled either, so I am making some 250mm circles a fgew inches wide, taping the duct to them and screwing them to my light shade hehehehe