I agree with controlling air and water separately. You want the water a bit cooler than the air, for sure. I don't heat my water at all but I live in So Cal and unless we have a super hot day, the water doesn't fluctuate more than 73-76 and air from 75-78. During summer it can get above 80 but then I just ran a small fan into the tank and it keeps it max at 82 which is at their high range but acceptable for short periods.

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