Definition
AHRI 340/360 is a certification standard for commercial air conditioners and heat pumps that establishes test procedures, rating conditions, and performance metrics for unitary equipment. This standard specifies how manufacturers measure Integrated Energy Efficiency Ratio (IEER) and part-load efficiency ratings for commercial cooling and heating systems.
Commercial Rating Conditions
AHRI 340/360 testing occurs at outdoor conditions of 95°F for cooling and 47°F for heating, simulating typical commercial building operation. Equipment is rated across a range of capacity levels, typically 36,000 to 240,000 BTU/hour for rooftop units and packaged systems. The standard includes part-load conditions at 75 percent, 50 percent, and 25 percent capacity to reflect variable occupancy patterns in commercial buildings.
IEER Ratings and Efficiency Selection
IEER ratings typically range from 12 to 18 for modern commercial air conditioners, with higher values indicating superior part-load efficiency. AHRI 340/360 certification helps engineers select equipment meeting ASHRAE 90.1 minimum requirements. Certified ratings are essential for demonstrating compliance with energy codes and evaluating long-term operating costs for commercial HVAC projects.