you may be much better off just using a refrigerated window ac unit. then you can keep your room sealed. figure about 3500btu of heat per thousand watts of light. the other thing you need to consider when doing a grown that large in a room in a house, is the electrical supply. how are you going to supply juice to all of your equipment. with that type of grow, lights, fans, etc, your probably going to be in the neighborhood of about 45 to 50 amps of electricity. none of this is a problem if you run a subpanel from your main panel. my room has a hundred amp sub panel in it. with all the lights, ac, circulating fans, hydro, going i'm pulling roughly 68 amps when flowering. i'm getting ready to order enough lights to set up two more flowering rooms. this time around i'm switching to the electronic digital ballast lights. i'm going to use six hundreds all the way on the outside, and a couple thousands in the center. i'm still going to keep the same amount of wattage. i've been screwing around with a six hundred watt, and a thousand watt light, for the last couple of weeks. both of these are the new electronic digital ballasts. so far, they are consistently using about 28% less juice than the conventional ballasts i've been using. not to mention, they're light as hell compared to the others. i'll try to steal my buddies digital camera this weekend and i'll post some pics of my room if you want. my plants right now are thirty eight days into flower and are about six and a half feet tall.imp: