Sounds like a whole lot of hot air to me. Yea you may be increasing the delta T of the condensing coil to air, and yes it may cause it to use the whole coil face(any commercially available A/C is going to do this anyway), but it's going to use it to dissipate the extra added heat from the refrigerant. The only was I can see this improving efficiency is if it was able to raise the pressure of the refrigerant without raising the temperature much, in which case maybe there'd be a benefit due to the increased pressure drop at a metering device.
Adam
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