This is the best solution I have found in this constant battle against the unrelenting Florida heat:
I use a 50' copper chiller hooked up to the hose and let it run until the temp gets down to where it's just about the temp of the hose water, maybe 85* or so. Then I hook up my immersion fountain pump I got from harbor freight for around 10 bucks and thow it into a bucket with ice water (I use an entire bag of ice) and let the water recirculate. After about 30 minutes in total, the wort is right around 70-75*.
I also stir periodically while doing this, which really helps.