Suffix with ballad

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it’s A 18 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: EER.

Random information on the term “EER”:
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The efficiency of air conditioners is often rated by the Seasonal Energy Efficiency Ratio (SEER) which is defined by the Air Conditioning, Heating, and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment.[1]
Taken from Wikipedia