thanks that answered my question almost fully. im going to try exactly what you said. i can bring it cold air from outside (and its winter almost) and push it threw the lights . the reflectors i have are sealed with glass and are made for air ventilation. thats the whole point of the whole system. trying to get co2 levels to the highest. want to get a small in line fan to bring in cold fresh on a timer when teh co2 is off and also i was thinking about putting the vortex that is just sucking the hot air from the top on a timer also to have it shut off when the co2 comes on. what do you think about that? the air im bringing in for the fresh air and also the air to push threw the lights is cold. its nighttime air that ranges from 39 to 49 on average right now and will get colder through the winter. let me knwo what you think. right now there is two vortex's and im decidign which type of cheap fan to get to bring in the cold fresh at the bottom