Quote Originally Posted by sum1cull911
If you don't/can't have sealed room, then supplemental co2 is pointless. Normal air quality already has approximately 300-500 ppm. Depending if you live in a city or not. The point of supplemental co2 is to get the ppm up there around 1500. You might as well sit your tanks outside your front door and let em open. It's not necessary to supplement co2, just a kick in the plants but to get growing.
thats not true, if the rest of your house is closed up the room doesnt have to be "sealed".

who grows in a sealed room anyway, you would need to run an air conditioner if your room was sealed (which creates more heat). and how would you control the humidity? mine stays constant at 40%, it doesnt go up to 80% and then trigger an exhaust fan. and my co2 stays constant at 1200 (from me breathing) it doesnt fluctuate around.

maybe i have bigger lungs than you i dunno.