CO2 with starts?

I threw a CO2 bag in a 2.5' x 5' closet with a couple plants a friend gave me to turn into mothers and they took off like crazy, seemed like twice as fast as the two previous weeks..

I just took a few starts and wanted to see if you guys thought throwing a co2 bag in the closet with them would be helpful or harmful that early. I tried finding old posts but they all focused on other growing periods, not really about fresh starts.

Thanks for any advise!

Those bag things are pretty cool. It won't hurt your plants but it would be kinda unnecessary when they are so little, the amount of Co2 in your room is more than enough for a couple of plants. I don't know how big you're planning to grow them but Co2 bags/bottles come in handy when you're growing big plants or in very small places. There are also a few things you need to take into consideration.
During lights out, plants switch from producing glucose to burning it. To burn the glucose they use normal "animal" metabolic pathways. That means respiring Co2. With that bag in there giving off steady amounts of Co2 you might asphyxiate your plants, although thats unlikely because your grow room would need to be airtight for that to happen.
Also Co2 causes temps to rise thus requiring more cooling/ventilation.

I had read something about no co2 when lights out with co2 generators. So I just go in and take the bag out when the lights are supposed to go out. I have a squeeze clamp holding it above the plants and in front of a fan to blow it around so it's easy to just unclamp it and put it outside the room for the dark period. Thanks for mentioning it, I was going to ask how important it was to not have co2 going with lights out. I plan to get a generator and controller for my main room so I don't have mess with removing the bags etc.

You must have a pretty big op going if you need a Co2 generator or are you talking about one of those small DIY chemical generators? A real Co2 generator is nothing but a fancy name for a propane burner and you would need some hardcore cooling if you run one of them.

No not really that big, 8 x 10 ft. I figured I'd get a small one that allows you to pull some of the hot air out through ducting and hook it up to my natural gas. I already had a valve put on my gas line to allow me to easily hook in to it. I'll add an AC unit at the same time or before I get co2 going. If there are chemical versions that will still allow you to control the ppm with a master controller I'd be interested in checking them out. Anything to help with minimizing heat. I have 2 vented hoods with 1k hps bulbs in the room and it stays between 79-82 but plan to make it 4 lights once I get the AC unit I want. I've already got the lights and tried running all 4 but i couldn't keep the room cool enough without AC. Unfortunately I can't afford the AC unit I want so I'm Savin up and making due with 2 lights. I have the carbon filter and a fresh air in on a temp controller for now, so it kicks in when the temp hits 80.

I'd like to set up the best room I can, with the most light I can, while still keeping the temp down, master controller, co2, dehumidifier. but I guess I'll never be "advanced" because I like growing mediums and don't plan to switch to hydroponics...

What chemical co2 generators are you talking about? I'll do a search next.

Nevermind about chemical generators. Those are cheap DIY for small grows. Baking soda and vinegar is probably the most basic Co2 generator to make. Dry ice is another good way to produce Co2 in your room AND also keep temps down. You want to make booze while producing Co2? Then try yeast and sugar water hehe.
However, these examples are for small closet grows, you said you have 4 lights then the only way to go is with a burner. Although they make cooling tubes for a burner, you can't exactly have any exhaust venting out of the room since the exhaust is what you need (Co2). A cool tube for a burner has a heatsink in it but what goes through the pipe is fresh air, preferably from an A/C unit.

Yeah I figure I'll pull from outside the room, through the co2 burner tube/heat sink and out of the room and through a roof vent. Just like the lights. That way I'm only pulling out of the room with the carbon filter to flush the room every now and then. I'm not even sure if you need to bring fresh air in and pull out through the filter every so often to flush the room or not? That might end up waisting a lot of gas to get the ppm back up. But I'll have the option with the way i've got it set up. I like the idea of being able to flush the room before I enter too.

Until I get the burner, for now, I figure since there is always fresh air coming in with the filter pulling out to keep the temp down. i'll put two co2 bags in the room above the fans so they can blow it around. I know the ppm will never build up with the air being pulled out, but maybe the plants can make use of some of it before it is pulled from the room.

Its better if you pull air from an A/C through your cool tube for the burner, it makes it more efficient.
I doubt you'll have any problems without a burner if you're pulling in fresh air from outside, having a burner is more of a commodity. There's plenty of polluted air outside to supply your plant's needs.
But, if you still want to get one you can probably just get one of those propane heaters from Lowe's and call it a CO2 GENERATOR <-- high tech. shit! You can't put a cool tube on it but what you can do is get an A/C unit but don't put in a window. Instead put it somewhere in the center of your room that way it will recirculate and cool your room but it wont "dilute" your Co2 rich room with fresh air. Put some fans on a timer so that during lights out (plants reverse to breathing oxygen) they air out your grow room.
Thats what I would do...

Well the AC unit will be in the room with the burner and plants, I don't want to pull air from the room while the burner is trying to get the rooms co2 ppm to 1500 do I? I figure I'll pull from outside the room so I can keep it a sealed room for max efficiency with both the co2 and the AC unit trying to cool the room. But if I'm still having a hard time with room temp I'll try your option or something else.