New Grow Room Mini-Split Sizing

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dgough

Active Member
I am building a room inside of my garage that is going to have a 8x8x10 flower room and a 8x8x10 veg/equipment room. Both rooms will be sealed so I am planning on (1) two zone or (2) single zone units to control each room separately. I am limited to 4 flowering plants and 12 vegging. The flowering room will have (12) cxb3590 Cobbs, a two burner Co2 generator and dehumidifier. The veg room will have a combination of T5's and HLG LED plus all the drivers for the flower room. I am located in SE New Mexico so it does get in the 100's in the summer and 20/30's in the winter. The garage is insulated and does damp these temps a bit.

Any advice on two zone vs a pair of single zones plus any sizing advice would be greatly appreciated.
 
Renfro

Renfro

Well-Known Member
Take all the wattage you are running in the room, lighting, dehu, everything, multiply that total by 3.5. Then add the BTU/hr of the co2 generator. Now take that total and divide it by 12,000. The result is the number of tons you need to cool the electrical loads, then you have to account for the room in the summer (manual J calcs) or just guesstimate that... Off the top of my head I wouldn't see you needing more than a ton in each space in the peak of summer.

Some mini's will also heat so that may be a handy feature during lights out in the winter.

A dual zone unit would be fine. Mitsubishi makes the best ones.

Make sure it has "auto restart after outage" and "low ambient" down to a number that will handle your winter lows. Some unit's will run at -27F and others will freeze up at 20F. The low ambient rating will provide a number that which below you don't expect the unit to function.
 
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ThatKidiscrying

Active Member
I’d oversize it a little. The unit will only run as fast as it needs to so it’s not like a conventional duct system that has to be sized correctly.

I’m on the fence if I’d get two separate units or a 2 head/one compressor set up.
 
Renfro

Renfro

Well-Known Member
ThatKidiscrying said:
I’m on the fence if I’d get two separate units or a 2 head/one compressor set up.
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I would go with two individual units just because if one fails you don't lose both rooms. But, if the decision involves getting a better quality brand like mitsubishi then go that route for sure. Two units may arouse suspicion if you are worried about stealth. I have two 4 ton condensers in my back yard, one for each flowering room. I wouldn't have been that ballsy back in Missouri, but I wouldn't want the $2000 a month power bill either, that would get you reported quick back there.
 
Renfro

Renfro

Well-Known Member
Never heard of them, i looked and they don't brag about using a good compressor or anything so likely low end generic.
 
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