Why measure carbon dioxide?
Most heating, ventilating, and air conditioning systems (HVAC) re-circulate a significant portion of the indoor air to maintain comfort and reduce energy costs associated with heating or cooling outside air. It’s virtually impossible for occupants and building operators to judge how much of the air coming out of an air supply duct is simply re-circulated air and how much is outside air. Current technology now allows easy and relatively inexpensive measurement of carbon dioxide (CO2 ) as an “indicator” to help ensure that ventilation systems are delivering the recommended minimum quantities of outside air to the building’s occupants.
