Coefficient of performance to energy efficiency ratio
Type a value in COP to get it in EER instantly.
40.95EER
That's 2× as efficient as a large office chiller, while the theoretical limit for a 20 °C lift is 1.22× more efficient. Every kWh of electricity moves 12 kWh of heat.
Convert the other way: EER to COP
What it means
How efficient is that?
These are steady-state ratings. Seasonal figures such as SEER and SCOP average over a whole year of weather and cannot be converted exactly from a single rating.
The math
How to convert COP to EER
To convert coefficient of performance to energy efficiency ratio, multiply by 3.41214.
Example: 12 COP × 3.41214 = 40.9457 EER.
In the other direction, 1 EER = 0.293071 COP.
Every unit
Your efficiency in every unit
Tables
COP to EER conversion table
| COP | EER |
|---|---|
| 7 COP | 23.885 EER |
| 8 COP | 27.2971 EER |
| 9 COP | 30.7093 EER |
| 10 COP | 34.1214 EER |
| 11 COP | 37.5336 EER |
| 12 COP | 40.9457 EER |
| 13 COP | 44.3578 EER |
| 14 COP | 47.77 EER |
| 15 COP | 51.1821 EER |
| 18 COP | 61.4185 EER |
| 20 COP | 68.2428 EER |
EER to COP conversion table
| EER | COP |
|---|---|
| 7 EER | 2.0515 COP |
| 8 EER | 2.34457 COP |
| 9 EER | 2.63764 COP |
| 10 EER | 2.93071 COP |
| 11 EER | 3.22378 COP |
| 12 EER | 3.51685 COP |
| 13 EER | 3.80992 COP |
| 14 EER | 4.10299 COP |
| 15 EER | 4.39607 COP |
| 18 EER | 5.27528 COP |
| 20 EER | 5.86142 COP |
Quick answers
Quick answers
- How many EER is 1 COP?
- 1 COP is 3.41214 EER.
- How many EER is 10 COP?
- 10 COP is 34.1214 EER.
- How many EER is 12 COP?
- 12 COP is 40.9457 EER.
The units
About these units
Coefficient of performance (COP)
Heat moved per unit of electricity, in the same units.
Energy efficiency ratio (EER)
The US rating: BTU per hour of cooling per watt.
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