chiller alternative

as a side benefit of getting an aquarium controller to open/close the solenoid to my Ca reactor CO2 unit it can also be programmed to turn off heat producing lights (and turn on fans) if tank temps get too high. (A side benefit I failed to consider.) I've owned a chiller in the past and I think that my current solution is better than owning a chiller- unless you have your chiller vented to outside the house.