I have a grow closet 4ft wide 2.5ft deep and 8 ft tall. with an exhaust fan at the top and ain intake fan at the bottom, and a cool air humidifier that cools the room and keeps my humidity at the right level....what if i add co2, do i still need the intake fan bringing fresh air in???isnt the point of fresh air to bring co2 in???I'm thinking as long as my fan circulates the air inside and the co2 is at the optimal level and the temperature is good , i dont need fresh air right????

right on the money....he he i saw this post and i was like...uh...i posted the same friggin post like a month ago...exactly the same name even...thought it was my post...but yeagh my answer was yes.....because i dont want to have to intake from a window or whatever i went out and bought the whole 20lb tank set up...regulator controller etc...havent set it up yet...this weel i will be...but...it should be amazing...it also can increase yield 30-100% which sounds great too......just turn off your exhaust to when the co2 goes off ...but ou dont even really need to exhauust if it doesnt get too hot...so its a win win with co2 a 20lb tank will last you a month or more and is only like 25 bucks to fill or exchange

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I use co2 and haven't vented or exchanged the air in 2 months. Other than opening the zippers and messing around inside or watering.
Plants need co2, and create o2 from it, which the roots use.

nope co2 replaces fresh air, co2 levels for optimum potency and yield range between 1600 and 2000 ppm depending on strain and temperature of the room as co2 levels rise the room temperature must also around the 90 f range . If no co2 dont go over 85

ok so i would have to raise the temp to 90?? are u sure that sounds to high.I thought if the temp was at 90 growth stopped or slowed down.

does CO2 need to have the high temps, or is it just better?

it just allows you to be able to run your temps higher it is not manditory to raise your temps and I wouldn't think that it would be better its just more co2

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I agree.
using CO2 does allow you to have higher temps in your grow room.
The whole thing with having higher temps is that it optimizes how
your plant absorbs CO2.
What that Temp is? I have no idea. I run 84F -91F in my grow room.
They say once you start using CO2 don't just stop using it. I guess it will have some adverse effects. (IMO) I don't really beleive that.

If your growing inside, then you should research your strain that your growing, and find out what zone it
comes from. Try and keep the plant at the temp that it's native to.

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ok you dont need to bring your temp up if your at 80 lets say and you want to add co2 but if you do it will increase the co2 absorbtion rate by the plants thus more growth. Proper temp using 1600 ppm of co2 is 90 f if not using co2 80 to 85 . By adding co2 you are also able to raise ppm of your food, regular indor air co2 saturation is 500 to 600 ppm, outside its 300 when you boost to 1600 ppm ive doubled my food up to 1600 ppm in the water to match co2 saturation.