What you are talking about are Stomates. Think of them as air vents in the leaves that allow respiration. If it gets too hot out, they close up to retain moisture. If the stomates are closed and respiration is not going on, the plant is basically in limbo. Very little to no growth occurs when the stomates are closed. There are those who say that room temps can be a bit higher with a properly CO2 enriched environment, but the operative word is 'properly'. Unless you have the room set to enrich, hold for xx minutes and then purge, it is not proper. Another common mistake is running the CO2 enrichment when lights are off. CO2 is best utilized with lights ON. Normal outdoor background CO2 levels should be about 330 ppm on average around the world. If you can get your room to about 1000-1500 then that should be plenty of CO2. If you are using a CO2 burner make double damn sure you have carbon Monoxide detectors in key locations as well. Sorry if you attached a pic, as I sure don't see it, other than an avatar pic which is too small to discern.