your question is very vague. You can run a decent size room on 2k's worth of lighting, how many? depends on how well u can fit them in there. The best way to keep the room cool is to use air cooled hoods, it doesnt matter where the air comes from or where it goes, just make sure you have them sealed off from the room. Aside from that u need to way to keep the rest of the room cool, an AC unit would work well, and then u could use a carbon scrubber to pull air from the room and vent it out side, this will keep the air fresh in the room. If your not worried about smell, then u dont need to seal off the hoods, or use a carbon scrubber
JackdaWack Reviewed by JackdaWack on . help me cool my grow room So a few years ago I had a grow room set up with 2 1kw lights, and 1 400 watt light, in a 10 x 10 bedroom. That was my first grow ever and I never got to the harvest cuz I ended up in the hospital for 3 days and by the time I got back my plants were all dead. When I had that grow room, I powered each 1kw light with a 6" 465cfm inline fan, that was venting into the bedroom next to it. It was a passive intake and I didn't bother to hook up the other end of the ventilation system from the Rating: 5