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EER – ratio between spent electric energy and gained COOLING effect.
COP – ratio between spent electric energy and gained HEATING effect.
The bigger the EER/COP, the more refrigerant/heating energy you get for 1kW/h of invested electric energy.
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Energy class – classification of air-conditioners by energetic efficiency.
There are 7 classes of energetic efficiency, from A (the best) to G (the worst).
Energetic efficiency is the ratio between spent electric energy and gained effect.
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