I run a 14,000 BTU Soleus Air portable. It handles a/c, heat and has a dehumidifier. It has both separate intake and exhaust that can be run outside the grow environment.
http://www.amazon.com/Soleus-LX-140-Portable-Evaporative-Conditioner/dp/B0019K8TRG
I'm still building my room out, it's an L shaped closet that is sealed. It has three separated areas, a work space, veg and flower area. I already tested out the concept with smaller a/c unit but decided to go aeroponics so I just redid the entire closet. I've been working on it for a week now and I'm almost finished. The room has been sound proofed and I made two DIY mufflers for the exhausts and intakes. Everything is very quite and stealthy. You can't even tell anything is even in the closet when the door is shut.
The ventilation works pretty simple. I fill the work area with a/c set at 75 degrees. The veg area has a 4" intake fan and 4" exhaust fan with a carbon filter exhausting back into the work area. The veg room uses 125 watt floro so it doesn't get hot.
My flower room uses a 600 watt HPS that is air cooled with a 6" 400 cfm fan and a 6" booster. The fans are controlled by temperature. They turn on when temps reach 78 day and 70 night. I also run a 6" 400 cfm exhaust with a carbon filter which turns on at 83 degrees. The exhaust fan is combined with an 8" booster fan that brings air in (cool air) from the work room. It's turned down using a variable speed controller which allows me to dial in a slight negative atmosphere when exhausting.
I run a CAP AIR3 to control the exhaust/intake fans and CO2. I've been running some tests on the room for the last 3 days and I'm able to maintain rock steady 78-80 degrees in the flower room and 75 degrees in veg. I'm running 30-35% humidity.
So far this setup maintain 1,500 ppm's, uses very little C02 and is very efficient. I'll be starting a grow journal for some AK48 and Blue Mystic in about a week.
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