COP: coefficient of performance. A measurement of heat moved divided by power consumed. Watts / watts. Higher is better. Most manufacturers use weighed (seasonally adjusted) measurements for performance figures. All refrigeration units are more effective and efficient when the outdoor air or ground water is close to the target indoor temperature. As the difference widens, it takes more energy to move the same amount of heat. The weighted figures make it easier for the common buyer to choose between units.
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