What are the common units used to express the Net Refrigeration Effect (NRE) in HVAC systems?

The Net Refrigeration Effect (NRE) is typically expressed in British Thermal Units per hour (BTU/h) or tons of refrigeration. One ton of refrigeration is equivalent to 12,000 BTU/h. These units provide a standardized way to quantify the cooling capacity of an HVAC system, enabling designers and operators to compare and optimize system performance.