Yep, me too. Lived in Arizona for the past 12 years and never needed a chiller for any of my tanks. Clip on fans are the way to go!
Plus, another thing to consider about chillers is that they are like window AC units, in that they pull the heat from the tank but release it to the environment around them. So a chiller will cool your tank, but heat up the room that it's in. That will make your house AC work harder, and if you don't have AC, the warmer room will heat up your tank, making the chiller work harder. They are not effective unless you have a way to vent them to an outside area.