[asphaltgambler]

While ambient air does affect the efficiency, there is a thermal net difference between the high pressure and low pressure side that really does not change much as ambient air changes. In mobile air conditioning for example; the maximum ability to remove heat is @55 degrees difference from outside ambient air depending on the level of humidity. So spraying cool water over the condenser (while it's running) would lower the high side pressure by directly making the condenser more efficient, which also lowers in proportion the outlet vent temps