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Old 12-20-13, 12:34 PM   #2
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Yes, a larger evaporator will make a heat pump more efficient. With more surface area for heat transfer, and the same compressor being used, the compressor will move more heat due to the lower compression ratio. How much more depends on your mass flow and lift.

The bugger here is matching the flows between the two units running off of one compressor. How easily that can be accomplished really depends on how the individual evaporators were designed. If they both have integrated distributors and txv metering, the job becomes much simpler. But if they don't employ the same metering method, or use cap tubes or electronic valves, they will hunt against each other.
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