Keep your room at about 85 degrees when the lights are on and 75 degrees when the lights are out. If your temps drop any more than that your plant will stretch and your nodes will not be as close together. Your a/c will help with the humidity but you will still need a duhumidifier to control the humidity. You want your humidity in room at about 60%-40% or as close as you can get to that. Good luck.

Quote Originally Posted by In Bloom
What an inspiring thread - cheers :thumbsup:

It's made me re-assess my set up and I'm going to try my next crop using a closed system like yours. Unfortunately where I live, I can't source some of the products you are using, so I'm having to modify the setup slightly.

I'll be growing in a 8'x6' room, using one split A/C unit with the heat exchanger outside. I've managed to find a similar but different make CO2 computer that comes complete with regulator, controller and sensor but I can't find a CO2 generator, so I have to use bottles. If I've read through your posts correctly, I'll be needing 2 x 20lb bottles and use them only during flowering.

I was also wondering what you do about temperature control. I'll probably set the A/C for around 77 degrees F / 25 degrees C and with the grow room temperature being controlled by the A/C unit, it will be a constant temperature regardless if the lights are on or off. In my current set up, my temperature drops when the lights go out. Do you leave your room at a constant temperature or do you drop it a few degrees when the lights out go out?

I'm also curious what the A/C unit does to humidity levels as A/C normally sucks moisture out of the air.

Any advice greatly appreciated, thanks in advance :rasta: