Is there any benefit to adding CO2 to a NON-sealed grow room?
if the lack of fresh air is causing flowering plants to delay finish, then yes, addinfg c02 will
speed up flowering for that grower.
no, c02 will not speed up flowering anymore than proper feeding and watering.
here's the deal=plants can use all 400 ppm's of ambient air, and around every surface of every plant the air is exchanged multiple times a second, refreshing the c02 supply-outdoors. Indoor we cannot move air like the outdoors does, and cannot replace the c02 at every surface of the plant as often.
In your non sealed room, assuming air is circulated with home/outdoor air as normal- your plants will thrive and you will enjoy a great experience, you will not be able to blame anything on the lack of c02.
In a sealed room like mine plants will also grow and thrive inside without the addition of fresh air, I dont use outdoor air for anything, there are no inlets , I am not anal about the entry door to the rooms and close it behind me mostly.
without c02 I can harvest normally but the weight is lighter, the smells are diminished, the plants are not as happy as I see them. I eel guilty when I dont replace the propane for a couple days even. A plant will grow to its weakest resource. lack of sun dammit thats my weakest resource and I dont want anymore
weakest resources. I run identical cycles with same feeds, no ph, no chems and can clearly see what c02 does for me. Cost me 12 dollars every 45 days to feed the c02 gen. Thats the cost of one small bud maybe, and better bigger ones are made available with my c02 augmentation. hope that helps. I would not advise running a c02 generator inside living quarters. It literally is the same as lighting a propane bbq burner. the units have nice redundant safeties , tip over, o2 sensors, pilot sensor, etc....but still.