Hi Carolina Girl,
I was in Edisto about three weeks ago. A friend of mine has a home on the sound side and we go there.
If you will go to the net to
www.littlegreenhouse.com you will find lots of information on misting systems and the various types of misting heads and cooling systems. On the left side of their page click on Misting Systems. And to answer your question about misting vs. irrigation there is considerable difference in the heads and their output. There are lots of sources of this type of equipment so if you want more info let me know.