Vent-free Grow room: LED, hydroponic, CO2

So, I'm planning on setting up a grow room in my garage (it'll be a box about 10x7', well insulated). I'm going to be using an ebb and flow hydroponic system (homemade), the Procyon 100 LED grow light in the flowering with with CFLs to ensure full spectrum lighting, CFL in the vegetative room, and a CO2 system (tank, regulator, timer). The rooms will be light-proof, but have air-exchange between them, but not to outside the growing environment (garage), with the exception of when I walk through the doors.

I live in an area where the temperatures range from negative twenty F to positive 100 F, and my garage isn't heated or cooled, so I'll be installing a heating and air conditioning system run on a thermostat to maintain 75 degrees F. I'll have a dehumidifier in the room set around 60% RH to keep mold from being an issue. CO2 will be pumped into the system to keep my gals happy and producing.

My question is this; using this type of extreme environment control, can I avoid venting the system? I don't want to be pulling below-zero temperature air into my grow room even in short bursts. In theory, this works (so far as I can tell); the plants get a constant temperature and humidity level, and CO2 so they can complete the photosynthetic process.

If it makes any difference, I'll be growing about 56 plants total:
6 Mothers (of different strains)
12 clones
24 vegging (in two different stages: veg 1 and veg 2)
24 flowering

I'll be harvesting 12 plants every month, depending on the particular strains' flowering time.

Please let me know if you foresee any problems before I start construction. Once I have the plans all set (assuming I can use this system) I'll get building right away, and I'll be sure to share some photos with you.

I can't really answer your environmental control questions. I might try to setup a way to heat the incoming air. Are you comfortable sharing what brand LED's ? How many watts/ft ? How many watts of CFL for flowering? What brand and color temp? What yield are you shooting for ? How are you going to calculate the CO2 settings on the regulator?

I'm using the Procyon 100. It's a hundred watt LED system that uses Cree LEDs (which currently hold the world record for brightest and most efficient LEDs). One thing I have going for me is that this will all be legitimate; I'm in a medical marijuana state, and I'm setting myself up as a care giver, so security from police isn't going to be an issue. Because of the laws in my state, I can't just start at full force, so I'll be flowering 6-12 to start until I can get more patients. Once I'm up to full capacity, I'll probably have to get another LED for the flower room (they say they're good to cover 10 sq. feet, but I'm going to overlight my room a bit).


I actually hadn't given the CFL a whole lot of thought yet; right now I'm focused on if I can get this system to work or not, then I'll start fine-tuning the details. As for regulating the CO2, I'm looking into CO2 controller that works between preset PPM ranges, along with a timer so it doesn't pump out CO2 at my 'night' periods.

For the yield, I want to get the most that I can without sacrificing quality. I'll be really irritated if I can't get at least an ounce per plant (for something like White Widow) and I'd really like to see if I can get it up to one and a half or so. Are these realistic expectations? If not, what are?

This will be my first grow, so if anybody has any recommendations on wattage per sq. foot, colors, brands etc, it will be welcomed with open arms. Also, if anybody has suggestions on which brands of nutrients are best (I want to use a three-fold system for optimum control at each stage), that would also be useful. I've been doing a ton of independent research, but every nutrient system claims to be the best without any real explanation as to what makes it better than the others. Ditto with lighting (the only reason I chose the LED system I did was because it uses Crees, otherwise I wouldn't have a good idea about that, either).

100 watts of LED wont cut it for 12 plants, and to a 10 feet room I highly doubt it will do that. most LED manufactures Lie about the coverage. I run a 600 watt LED in my grow operation and It says I should be able to cover 100 feet. I have it in 60 inch tall 60 inch wide and 20 inch deep and regardless of that claimed 100 feet coverage I still feel like i need to move my plants underneath it for max light coverage. As for vent free , yes you can run a grow operation with out fans or vents but the stems wont be able to support the buds and you would need to tie it to something. Id say it is better to veg your plants under LED and it would be better off to put lots of CFLs in your flower room.

Heat pocket will built up and eventually burn plants without ventilation.

Just leave a little opening for air to get out for air exchange and you'll be fine with no vents.

with Pure LED lights and no CFLs you can get away with no vents