Can't hurt to try evaporative cooling out. You probably have a suitable fan around, or can get one pretty cheap. Just aim a fan at the water and see how it does. Your heater should keep the water temp stable while the fan goes at it. I'm currently working on hooking up my fan to an AquaController to reduce energy usage and evaporative loss. (Plus my heater thermostat stinks, looking forward to fixing that.)
If the look of the fan bothers you, you can do fancy stuf to wire fans directly into your hood.
wants to sell you a chiller. No surpise there. You can always get the chiller later if the fan does not work for you.