Planning my indoor grow and would like some advice

Hey all. As the title states I am in the planning stage of my indoor grow and would like to get some feedback, specifically on cooling, but all topics are welcome for discussion.

My current plans are to build a completely sealed grow room in my attic space. The dimensions of the entire room will be 12' x 15' x 7'. This entire enclosed space will be further segregated into breeding, vegetative and flowering sections, with perhaps a storage area (have not decided on this yet).

The entire blueprint of the room is still in flux at this point, but as of right now I am planning on a 6' X 6' breeding room, a 6' X 6' vegetative room and a 9' X 9' bud room.

I plan on using a MH/HPS setup with two 600 watt lights in the bud room, and one each 1000 watt light for the breeding and vegetative rooms. I will run a sealed air exchange system from the outside of the house to cool the lights and will vent the heated air into my garage.

Since this is a controlled grow environment I will have to add CO2, and have yet to determine what method I will go with. Right now I am leaning towards a propane based system on an automatic system.

Obviously with the lighting, CO2 system, humidifier (if the air conditioning unit does not perform this task), and heat from the fan motors I will need a good air conditioning system. While I like the water-cooled air conditioning units, they appear to be prohibitively expensive.

So, what system would you folks recommend, and what BTU rating should I install? I would love to get your feedback.

You are probably going to have to get wall mounted air conditioners, as portables aren't good for a grow this size. Many people don't like the portables at all. You need to estimate roughly 3000 btus per 1000w air cooled, and probably about 2000 btus for the 600s. Then again you are going to be adding CO2 so you have the luxury of higher temps.

I'm interested in seeing what everyone else has to say.

Yeh, that has been my problem. From all of the reading I have done I have gotten estimates on btu of as low of 12K and as high as 36K. Additionally I have read everything from I should only go with a mini-split, to portables are fine if a bit inefficient, to window units will work best ... and everything in between.

The cooling is what really has me flummoxed at this point and I would really like to get some additional feedback.

sorry rooms i build are ushaly in a bedroom or basement with windows.. all you can really do from this point is put it together and fix the little bugs, and kinks as they happen. your plan sounds good, i use widows for intake and exhauset out my bedroom door.

Thanks for the feedback mygirls.

I think I am going to go with a mini split rated at two tons (24,000 btu). At a conservative 4500 btus per 1000 watt light, and since at this point I am thinking of running up to five total lights (I know, I know - that is different from what I said above, but this is, after all the planning stage ) .... anyway that puts me at 22,500 btus of cooling needed. With a two ton unit that should more than adequately cover my cooling needs.

At this point I have realized that I am going to have to run a separate electrical panel for my grow. Unless my math is incorrect I see the following power needs:

5 lights at roughly 10 amps each = 50 amps
Miscellaneous fans = 10 amps
Humidifier and Dehumidifiers = 10 amps
Two ton mini split = 50 amps
Misc lighting (non-grow) = 10 amps

So, being conservative, I should install a separate 150 amp subpanel. Anyone see any problems with my math?