Comment This should have been a thing during the pandemic (Score 1) 5
For ages, we have had thermostats to tell us the ambient room temperature, and to adjust HVAC settings accordingly. And more recently, they've gone smart--letting us see and control it automatically, or manually with a smartphone interface.
Why not also have this technology for measuring CO2? The sensors are not expensive, they don't need a lot of power, and they are low maintenance. CO2 is a reasonably good proxy for indoor air quality with respect to environments occupied by humans. And you don't need to modify the existing architecture or install ductwork.