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: