My question has 2 parts about Sustained optimal fl...

No benefit, detrimental to have high co2 without temps to alter metabolic pathways, plant will shrink stomata under high co2 levels, without the temls to match the plant s forced to perform gas exchange through much smaller stomata. Potetially hindering growth.

Hey 👋, Temperature Range should be between 20-25 Celsius. Additional CO2 is Not Worth it in my opinion as mostly your cost/benefit ratio is Not good at all. Just keep it simple, it’s weed. Have fun 🖖🏾👊

just try your best. added CO2 is useless unless the room is sealed and your pushing higher then 40DLI, have a good VPD RH/Temp ratio and it will do just fine. Don't over think it.

This is an answer you cannot get from observing a plant with human eyes and senses, so nobody can answre this in a specific way. It's about various rates of change interecting / contradicting each other etc. Large samples, precise measurements and repeated experiments needed. Sure, you get less evaporation with cooler temps or higher humidity (vapor pressure vs condensation pressure is the 'gradient' mentioned. these are 2 rates that result in net loss/gain or equilibrium over time, plus in this context you also have rate of production, too), but it also will reduce the amount of potential photosynthesis per day - which reduces co2 use. Products of photosynthesis are needed to power molecul building of cells -- whether cell reproduction or just shit cells make to function and live. If you do something that reduces potential photosynthesis, less CO2 will be used. You could maybe extrapolate based on photosynthesis vs temp curves... i don't know if it's 1:1 proportional, though, but that info too could easily be out there already calculated. If you reduce DLI 10% you can reduce CO2 X% etc... You will still benefit from excess co2 as long as the temp/rh part of that equation doesn't pull it back down to 'ambient levels' as a ceiling... the 'max' co2 you can use is a product of the climate variables. if those variables calculate to ~300-600ppm, your ambient co2 then becomes 'enough.' local measurement needed, of course. now, at what point does focusing on limiting terpene loss cause greater net-loss due to a slower rate of terpene production or reduced maintenance (involved?) of terpenes in the plant? this is what i mean by numerous rates of changes being involved... this is calculus and to study any one component a time, you'd need to tightly control all the rest. then repeat experiemetns numerous times over to verifiy results / conclusions. It's a slow process. Then repeat with each relevant factor or combinations of factors to paint the full picture of reality. 90% of initial studies are later debunked, which shows how much work it takes to prove just a correlation. Simple contexts are different, but this is not one of those. So, if you find somerelevant research, keep that in mind. if it's a simple situation where an obvious measurement is taken and you read over the methods to make sure they are sane, you can have more confidence in that context. if you focus on any one bit it seems like you can do something that will have an obvious positive effect, but it also impacts other parts of the overall equation, which can easily negate those benefits.

Look at why you will be evaporating terpenes, which is almost entirely due to the natural trichome head damage (and subsequent capacity to leak volatiles) cycles where damage during the day is then repaired during the night. From this perspective, and bringing in precedent with Cannatrol's multiple patents and downstream impacts, any smell that is going to be avoidable is coming from you damaging trichome heads (manually or by environment). From my understanding, this logic boils down to minimizing vapor pressure gradients that would risk rupturing the 2 molecule thick trichome cuticle...but also needing to stay out of mold range...and your other fundamentals (like the correct spectrum, PAR, day/night delta, etc.). This brings you to looking at dew point as a way to carefully approach moisture in the flower , and to staying away from compressor-driven devices like most dehueys and ACs. Statistically speaking, hell no - you would not....