Combined Energy Efficiency Ratio (CEER) measures the cooling efficiency of room air conditioners, portable units, and some small-capacity systems under typical use conditions. CEER integrates multiple operating points to reflect variable indoor and outdoor temperatures experienced throughout a cooling season. It provides a more practical efficiency metric than steady-state EER ratings for these applications.
Technical Standards
CEER is calculated following AHRI Standard 1200 and is expressed in BTU/watt-hour. The rating incorporates outdoor temperatures ranging from 82°F to 95°F and indoor conditions at 80°F. Room air conditioners typically achieve CEER ratings between 8.5 and 12.5. Minimum standards established by the U.S. Department of Energy require specific CEER thresholds based on unit cooling capacity in watts.
Energy Labeling and Consumer Impact
CEER is displayed on the EnergyGuide labels attached to room air conditioners at retail locations. This rating helps consumers compare operating costs and select efficient units, potentially reducing energy consumption by 20 to 30 percent compared to older equipment. CEER-based comparisons are essential for identifying cost-effective options in the residential window and portable air conditioner market.