若要比較實際的評估一整年的能源效率,在產熱系統可以用季節化的性能係數或季節性能係數(seasonal coefficient of performance,SCOP)。空調多半會用季節能效比(英语:Seasonalenergyefficiencyratio)(SEER)。季節性能係數是新的研究方式,評估在實際應用下
1146/annurev.es.13.110182.001125. Wiklund, Christer; Tullberg, Birgitta S. Seasonal polyphenism and leaf mimicry in the comma butterfly. Animal Behaviour.