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EER
EER is the energy efficiency ratio in cooling at rated conditions: cooling capacity divided by electrical power input.
EER (Energy Efficiency Ratio) is an instantaneous cooling efficiency figure. It shows how many kilowatts of cooling the unit produces per kilowatt of electrical power at standard test conditions (usually +35 °C outdoors and +27 °C indoors).
EER is the cooling counterpart of the heating COP. For modern residential equipment the seasonal SEER is more commonly stated, but in commercial and industrial equipment, where units run close to rated capacity for long periods, EER remains important.
- EER matters for server rooms, shops and offices with high heat gains.
- When comparing units, check that EER is stated for the same conditions.
- For homes, SEER gives a more informative picture of annual consumption.
- A year-round cooling load (e.g. technological equipment) also requires checking the outdoor unit’s winter operating limits.
When designing commercial cooling, our engineers assess both EER and part-load figures so that the Mitsubishi Electric system is efficient in real operation.