The EER (Energy Efficiency Ratio) is an energy efficiency index widely used to classify air conditioning and refrigeration equipment. Unlike COP which uses kW/kW, EER expresses the ratio in BTU/h per Watt.
EER Formula
EER = Cooling Capacity (BTU/h) ÷ Electrical Power (W)
Relationship between EER and COP
| EER | Equivalent COP |
|---|---|
| 10 | 2.93 |
| 12 | 3.52 |
| 14 | 4.10 |
| 16 | 4.69 |
| 18 | 5.28 |
Conversion: COP = EER ÷ 3.412