well my hole flwering room 534sqft . and no i don't run co2 yet but will be here soon.. and as for heat problems the hottes it gets in there is 83 degres the inline fan is allways on ALLWAYS!!!it takes the heat out of the room in under 2min . i have plans to sealed my hoods with the glass connector and i will be sucking the heat out with a 6 inch 460 cfm inline fan...