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The bottleneck might be the air in the room
(blog.mikebowler.ca)
This is a most excellent place for technology news and articles.
This is absolutely something HVAC professionals consider, buildings with a central HVAC system are constantly mixing in outside air for exactly this reason. Installing co2 monitoring in rooms is also done for this exact reason.
This blog post is not for HVAC pros.
No, but it shows that hiring one is a worthwhile investment.