Hey SC Your post is a little confusing but I'll give it a shot...

Co2 never goes bad or stale..it is simply diluted or converted by your plants into O2.
You are in a pretty good position if you need heat. Co2 burner for sure. I was just looking into a natural gas unit for when I get a greenhouse. I would love to tap off my utility gas line and not have to go to the store to get refills.

here is a link I was just reading into. i like the remote burner scenerio...

Peace friend...http://www.hydroponicequipment.com/infopages/co2.shtml
CaliJay Reviewed by CaliJay on . Circulating CO2 I was reading about the perfect grow enviornment. while reading through it said that if you have a constant temperature that is not increasing, a constant humidity level, and co2 input you would not need exhaust for your grow room. My question is how long does co2 stay active? when does it get to the point where youre replacing the co2 instead of adding on to it? i am trying to keep my heat up due to the fact i am not able to use a heater because i dont have enough watts. thanks for any help. Rating: 5