Ok, I will bite on this one. When you are looking for heat exchanger parts for stuff under a ton in size, you're talking about window air conditioner and dehumidifier parts. Below that is refrigerator parts. Above a ton, under 2 tons, you're talking about car and van AC parts.
You will find that the main spec for these parts is the noise they make. Other than that, water conducts heat better than refrigerant. So there you go.
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