Refrigeration capacity is the maximum amount of heat that a cooling system can remove per unit time, typically measured in tons or BTU/hour. One refrigeration ton equals 12,000 BTU/hour. System capacity must equal or exceed the calculated refrigeration load for effective climate control.
Capacity Specifications
Residential air conditioners range from 1.5 to 5 tons. Commercial systems exceed 50 tons. Capacity depends on compressor displacement, refrigerant type, evaporator and condenser sizes, and operating conditions. Standard rating conditions assume 95 degrees Fahrenheit outdoor temperature and 80 degrees Fahrenheit indoor conditions.
Performance Factors
Actual capacity varies with indoor and outdoor temperature differentials. Higher outdoor temperatures reduce capacity by approximately 3-5 percent per 10 degrees Fahrenheit above standard rating. Proper airflow across coils is essential; reduced airflow decreases capacity proportionally.
Selection and Application
HVAC professionals select capacity based on detailed load calculations to prevent oversizing or undersizing. Matching refrigeration capacity to actual load optimizes efficiency and equipment lifespan. Nameplate capacity ratings provide baseline performance expectations under specified conditions.