Geothermal is four times as efficient as fossil-fuel-burning furnaces and twice as efficient as a conventional air conditioner.
地热系统的效率是石油燃料炉子的4倍，是常规空调的2倍。
Geothermal is four times as efficient as fossil-fuel-burning furnaces and twice as efficient as a conventional air conditioner.
地热系统的效率是石油燃料炉子的4倍，是常规空调的2倍。
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