Question: Explain why heat pumps that use air as the cold reservoir are most efficient in mild climates. (They are called air-to-air heat pumps.) Why does

Explain why heat pumps that use air as the cold reservoir are most efficient in mild climates. (They are called “air-to-air” heat pumps.) Why does a heat pump that uses water from deep underground as the cold reservoir have a thermodynamic advantage over air-to-air heat pumps when the weather is very cold?

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