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Meaning of cooling degree-day

cool'ing degree'-day

Pronunciation: [key]
  1. a degree-day above the standard temperature of 75°F (24°C), used in estimating the energy requirements for air conditioning and refrigeration. Cf. growing degree-day, heating degree-day.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.