Please help 8x8x10 grow room

Hello everybody i really need help

grow setup

8 by 8 by 10 grow room
1000watt m/h and hps
eletric ballast
6'' inline fan about 400 cfm
carbon filter

so i have the carbon filter ducting to my hood then ducted out through the attic with the fan pulling air outside. And i used panda plastic all over the room which means its sealed all around. My question do i need fresh air coming in from somewhere or can i use a co2 i think its going to be really hot i have ac running with two fans bowing air around so if you have any idea on what i should do please let me know asap!!!!

Thanks

1 1000 watt light is not gonna cover an 8x8 room buddy. 1000 watts covers a 5x5 at most, 4x4 really good. 8x8 room needs 4 1000 watt lights to cover properly. Yes, you can use co2 instead of fresh air flow.