I have to disagree with jamstigator, because if what you said was true than you couldn't hang your fluorescents within inches of plants (which you can.)

Run your fans and your CO2 system on a timer so the fans turn off (except for an oscillating) when the CO2 Turns on, I somehow highly doubt you'll have significant heat problems from turning the vents off for an hour a day to give your plants CO2.

Lookin' good Tico! Can't wait to see how much bud you get.