I was told by my local shop that I can simply use a water chiller to keep the water at a desirable temp if I wanted to set up a system out doors. I live in Fort Worth TX and last summer we had several 100+ degree days in the summer. Anyway, he told me if the water is chilled that the plants would thrive just fine. Does this guy know what he is talking about? I'm new to this and am already getting frustrated by how many different ways there are of setting up a system. I just want to grow some nice veggies!