A ground-source heat pump uses the earth as a heat source in winter. What is the primary reason this is more efficient than an air-source heat pump in cold climates?
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A
Ground loops use less refrigerant than air coils
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B
Ground temperature remains relatively stable and warmer than air temperature in winter
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C
Ground loops operate at lower pressures, reducing compressor wear
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D
The earth provides free electricity to assist the compressor