I tried one while living in Grand Prairie, TX. It is a subburb of Dallas and not as humid as the Houston area. While it was dry outside for a month or two, it was fine, but then it started raining several times a week and there was mold growing on the ceilings and other odd spots. It did cool nicely unless it rained. I removed it and shifted to a regular 3 ton window unit and spent some time cleaning up the mold problem.
I would not recommend using it anywhere east of San Antonio...the dryer the climate the better. El Paso has thousands of them.
Greg Luckett
Great Lakes Wood Arts Co.
Saint Joseph, MI