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Last time I thought about improving A/C efficiency, I looked to passive solar homes for inspiration. Some of them draw intake air through a long conduit underground that serves as an air/ground heat exchanger. (The home uses a solar chimney to draw warm air out of the house passively.) Taking a page from that book, one could run the same kind of duct to the heat exchanger (which would require a shroud) to provide the same kind of benefit as the misters, but without water. Pumping the cool air directly into the home would be the next logical step (and even better) but would be a much more complicated modification when you aren't building new.
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