actually, after i air cooled my lights my heat source was practically gone. now it is a battle of heat supply for my room. i have my CO2 on for 4 min. then my room is shut off (no exahaust) for 1 hour. after the one hour of co2 circulation in my room i turn my exhaust of for 10 min. and right after i turn it off i hit with another 4 min. of co2 for an hour and so forwth.
the tank is around $200 but luckly enough i was able to barrow one from the place i work. the release valve is ~$160. once you have those two things you can grab tubbing for about 15 cents a foot. i will post pics once my lights are on tonight at around 10:30 of my set up.