Co2 worth it ?

I was watching a dude that was saying avg house has enough co2 in it and it would be better used in like a greenhouse when you have high amounts of p,ants and little inputs like furnace oil wood or gas , people and animals. Youd be better off putting your money in high end lights

You'd be surprised at how high your ambient co2 in your basement would be. Especially if you work in that area. But, if its totally sealed off. And no new injection of air (that brings in new co2) then, maybe it would be best to get it checked. As, and plants in a sealed environment will eat co2. But, if you can breath in your basement, then, Its not really sealed. So, as ppl said. You need a 95-100% sealed space.

Organoman is right, don't worry about CO2.

Pet rabbits make plenty of CO2. @Organoman is correct. If your environment is not a closed system, you are just wasting money leaking CO2 into the air.     I would get a cheap CO2 meter and see what the ambient levels in your home are currently. My former home had central A/C, but did not recycle fresh air into the house like modern A/C units can do. As a result, the ambient CO2 levels in my house were elevated to near 1000ppm. Not very healthy for humans, but the plants loved it.

Unless you are growing in a closed system, any gains would be miniscule...........save your money.

I'm using Exhale CO2 bags for the first time this grow. I have a CO2 meter and it's showing an increase of about 400ppm on average compared to fresh air. It's definitely making a difference, however it's also increasing my humidity more than I expected. They take a few weeks to get going and I believe they peak in output after about 3 months - I've had mine for about 3-4 weeks now so I think it'll still increase in output a bit more before it starts to die. I am growing in a 4ft x 4ft tent inside a fairly well (but not completely) sealed room that is probably only itself about 8ft x 7ft in total. The tent exhausts straight out the top and into the same room. Even with the window open a few inches to stop condensation building up, the CO2 inside the tent is staying above 600 consistently, hits 800 regularly, and often reaches >1000ppm. I'm looking to get a dehumidifier to allow me to close the window and I suspect the CO2 bag will hit the higher numbers more regularly then. It seems to work in cycles - like the plants aren't always expelling Oxygen, the fungus aren't always expelling CO2. But yes, it seems to be working as far as I can see. Any gains from CO2 are relatively minor though, and you have to have absolutely everything dialled in perfectly to take advantage of it, so I would make this the last thing you spend money on after you take care of everything else - lights, heat, airflow, nutrients, etc. Good luck!