Is anyone else doing hydroponics in the South? [View all]

I thought I would try hydroponics this year and I'm putting together a simple flood and drain system based on a 55 gal barrel as a reservoir and around 8-12 3.5 gal buckets with 10" media inserts. I probably won't be filling my reservoir up to capacity. This type of system is often used indoors, but I'll be doing this on my back patio, which is covered. My concern is that daily temperatures often average about 87F here in the hottest part of the summer. From what I've been reading, water temps above 75F are problematic for disease and nutrient absorption. Burying my water reservoir is not an option. I'm just wondering if anyone else is doing this in hot climates and what problems you have encountered.