The resistance to airflow within an air distribution system of a heating, ventilation, and air conditioning (HVAC) system is a critical factor affecting performance. This resistance is measured as a difference in pressure between two points in the ductwork. A common example is measuring the pressure difference between the supply duct and the return duct of an air handler. This measurement reflects the amount of pressure the air handler’s fan must overcome to deliver the designed airflow.
Maintaining appropriate levels is vital for energy efficiency and occupant comfort. Insufficient pressure can result in inadequate heating or cooling, leading to discomfort and potentially higher energy bills. Conversely, excessive pressure can overwork the air handler’s fan, resulting in premature equipment failure, increased noise, and wasted energy. Historically, monitoring this parameter was less common, but advancements in HVAC technology and a growing emphasis on energy conservation have made it a more widely recognized and monitored metric.
