Sorry, no CO2 experience. All I grow is for wife and I only, so never a need/desire to invest in that kind of stuff.
I don't even use cool tubes, or anything like that. I have played around with a sheet of plexiglass hanging directly under the lights as a direct-heat barrier, but not really sure it helps much. Still adds to the ambient temperature.

The quake was in northern Nevada. I'm just south of southern Nevada, (Arizona) and didn't feel a thing.