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Old 02-19-20, 03:21 PM   #3
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You would suffer a noticed penalty to energy efficiency. Air isn't a great heat exchange medium. The indoor exchanger is sized for a certain amount of cool air coming in. Choking the airflow and raising the incoming air temperature would reduce its heat transfer capacity. Also, the water temperature would be limited to somewhat below the leaving air temperature. Plus all the air and heat leaking from the air loop.
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