c02 enrichment

Do you still need an exhaust in your garden if your using a lot of c02?

not if the temp is staying at a range of 68-88 Degrees...but yes fresh air helps

You can go up to 95 degrees if you're adding co2.

yeah i guess you could...but i wouldent push it...its always nice to stay a safe distance so you have some play...

I have temps under control.

you need to exhaust the room and re-fill it with new co2 every hour or so. what are your temps and how are you cooling the room?

You have to refill with new c02? Even if you're using a tank and regulator? I am using a air conditioner and water cooled lights after winter to keep temps down.

it sounds like you have an awesome setup. how many watts are you running and how many btu's is your AC? is your AC dual hose or single hose design? i need to know the answers to those questions to get an accurate portrayal of your setup. i suggest getting a co2 generator as opposed to a tank/regulator because they are much cheaper and more efficient in the long run, as well as the fact that they raise less suspicion. you can buy one for the same price as a tank and regulator. i got my Green Air CD-18 for 150 off of ebay. look around...there are good deals. if you already have a tank, then its no biggie. it all has the same effect in the end right? if you use co2, you still need a way to vent the air in the room every hour, then you would need to refill to 1500 ppm. i run a 12000 btu AC to cool 1600watts of HID lighting, works like a charm and keeps the temps under 75 most times...

You do not need to replace Co2, only maintain it at optimum ppm.
you will need a co2 controller to keep levels within range otherwise you cannot run a completely sealed room. No need to vent the room at all, plants use the co2 and make oxygen while lights are on and when lights are off they use a portion of the oxygen they produce to make co2. Entering the garden will give you some air exchange from adjoining areas but it is not required. I have both of my rooms sealed and run full time co2 during lights on except late in flower. You may need an A/C unit or chiller to keep room temps in check. I use a carbon filter and vortex fan to recirculate the air within the room to keep smell down. Hope this helps...Peace

I think for my next grow i'm gonna use c02, looks like the pros far exceed the cons.

hmm. iv always heard you have to do an exchange...thanks for clearing that up.

I'm planning on getting a controller and I already have a ac to cool the room.