cool tubes will drop you down temps quite a bit. personal experience, 600 watt hps in a 4x4 closet. 95*f temps. introduced a air cooled hood temps dropped to mid 80's. AC and/or heater will be rated by btu. btu is calculated per your cubic feet of the room. google for a btu calculation. as someone said and most of us practice, run your lights at night time. i personally do not suggest 6 intakes. with so many intakes you make it very easy for bugs to thrive in your room.