Co2 & exhaust

If I run co2 do i have to exhaust?, I can maintain temperature with a/c and my hoods are vented with inline fans.

In short no you won't need to exhaust.

Exhaust is meant to remove heat or to replace air/co2 in the room in cinjunction with intake. You have temp straight and are augmenting the co2 level so no need to exhaust the room.

That makes my build easier....what ppm of co2 should I run in early veg?

Should I increase or decrease co2 in flower room?

1300-1500 ppm is optimal. u can inject from start to end.