Hey bud. This is why we put things on paper first. Know that I have it laid out I think some changes need to be made.
First off, I think you can do 12 plants pretty easily under 2 lights. Assuming you bush them out a little to keep them short and each plant has a width of 18-24" then you will have no problem fitting them all under 2,000w. A 1000w light has a footprint of roughly 5x5. That footprint increases when you have 2 lights side by side. So covering a plant area that is 3'-4' wide and 9'-12' long will not be a problem.
I would try and keep the chiller outside of the room as well. Not a big deal but they do produce heat that should be exhausted out of the room. I'm not sure which one you have but it soulnd like you are running you nutrient solution through the chiller. This is not a good idea and will lead to chiller failure. Not sure how the aquarium ones function but maybe they work for this application since they are designed to run saltwater through them anyway.
Your venting is gonna be tough. Long runs like that with curves in them just kill the CFM on a fan. You might have to oversize the fan (10" high output) and use a duct reducer. Also, hang your carbon filter and fan close to the ceiling to save room.
The light controller box and hot strike box are differrent. I use C.A.P. and I've never had a problem with them. I'd recommend the MLC-4XT which has the built in timer. For the hot strike box I'd recommend the HLC-3e.
With 2 lights I think you can get away with venting them back into the room if you get all the other equipment that produces heat out of there. I would still try and vent it outside but maybe getting extra fans and all that ducting might not be worth it for now.
I think it would be way more efficient to have your a/c unit on the North wall if at all possible. This will keep the lights from interfering with the air from the a/c and will blow cold air directly onto your plants. Not that big a deal though.
Let me know what you think. I just realized I messed up the ducting by accident. Should be pulling from up top and venting down below.
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