jhnrb - I'm looking at getting a controller to do the same on the fans in my sump (among other things). Fortunately for me, Premium Aquatics is my LFS, and they sell these affordable controllers. Take a peek at it....here's the description for additional temperature control: (
Neptune Aquacontroller Jr)
Quote:
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Additionally, the AquaController Jr has many more features for temperature control. For example, if the temperature of the tank exceeds a preset value, the AquaController Jr can turn on a fan to cool the tank. If the temperature rises higher, an additional fan or chiller can be enabled. If the temperature rises even higher, lights can be shut off. There is really no limit to the number of ways that the AquaController Jr can control the temperature.
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Hope it helps!