Paragon...you are scientifically correct as are the others. The properties of refrigerant are constant...at a given pressure it has a given temperature, regardless of humidity. Humidity over the evaporator coil is turned to condensate water slightly above the temperature of the coil itself. Thus the discharge range of 17-20 air on/off the coil. So I will concede a slight effect but very little. The example in your quote is highly exaggerated. A portion of all air conditioning capacity is dedicated to humidity at about 50% relative humidity standard. The higher the humidity (latent load)the lower the sensible temperature difference across the coil. So I will correct myself and say it does have some effect but in the practical world not much. In a proper operating 134a system you'll still get 17-20 split across the coils across the humidity range. At higher humidity how the discharge temperature feels to the person is a totally different story. Humidity is so Insignificant my technicians don't even consider it when making diagnosis.
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Jonahs
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