I just recently set up a completely sealed room for my next grow. The idea of a sealed room is that you have no exchange of air, no intake or exhaust fans. You keep the room temperature down by running an inline fan ducted through your sealed hood sucking cool air from outside the tent and once its blows through the sealed hood it exhaust the hot air outside the grow room. If it is still to hot you will need to run a dual hose portable a/c to keep the temperature perfect. Since you have no fresh air coming in you will need to run co2 tanks to keep the air co2 rich. In a 5x5 sealed room a 20lb co2 tank should last a week. 20lb co2 tanks cost 20 dollars to fill so at 20 dollars a week thats 80 dollars a month to run co2. co2 increases yields as well. I run a 1000watt hps lamp with 12 plants flowering under it in a 4x4 grow space in 2gallon pots. I grow hydro using the ebb and gro system made by CAP. Then you need a fan inside the grow room circulating the air within the room to prevent mold from the air not moving. Also you will need a humidifier or dehumidifier depending on the location of the grow room.