I plugged it in and put it in the grow room and I'm getting around 512. That's with everybody pretty much on the downside of the Grow. Even RUCU CUCU is maybe 15 to 20 days left on her and she'll be the last one that I harvest. So I kind of imagine that when all these girls are in veg and early flower, That 512 is probably much lower. I think that may be an explanation of some of the things I've noticed since switching over to the window unit AC which keeps the room pretty much sealed. At least it's not like it was when I had the single pipe portable AC in there.. That was probably about the only positive thing about that portable AC was that it brought in fresh CO 2. Definitely not very energy efficient, especially since I don't keep a majority of the house super cool. Except in the winter time!That's normal. In-house your CO² values are on average double that to the outside. Outside I measure 400-450ppm and inside this doubles to 880ppm and bedrooms are even worse. We spend more time in that room then any other and tend too forget to ventilate that space...So use that air for your plants and add to that a reasonable sized yeast generator and you'll have plenty of CO² to run everything a bit higher then normal
Well at least I know now! Knowledge is power for sure.