If the CO2 concentrator could be minimized, it would make an excellent addition to HVAC systems - would minimize the need for outside fresh air if you could jus

If the CO2 concentrator could be minimized, it would make an excellent addition to HVAC systems - would minimize the need for outside fresh air if you could just capture the CO2 exhaust from human occupants and expel that. Could even have houses and offices with sub-atmospheric CO2 concentrations!