Hey dfx, I'll keep my thoughts brief for ease of reading 
3 plants sound good
You will need some fresh air in the room, not necessarily an air conditioner
Heat might still be a problem - you'll want to keep your inside cab temp to 70-85f
Don't worry about co2 - just breath
and there'll be plenty in the air
3 plants could really smell - you need a good outtake fan and carbon filter for removing heat and removing smell
I'd get room air freshen era they are plugged into the wall - quite good
I don't understand nouning - sorry
All the best
Blue
3 plants sound good
You will need some fresh air in the room, not necessarily an air conditioner
Heat might still be a problem - you'll want to keep your inside cab temp to 70-85f
Don't worry about co2 - just breath
3 plants could really smell - you need a good outtake fan and carbon filter for removing heat and removing smell
I'd get room air freshen era they are plugged into the wall - quite good
I don't understand nouning - sorry
All the best
Blue