Thought of that long ago. I'd rather have a cold room where everyone including my fish, my fluffy old English sheepdog, my wife and I are happy rather than all of us suffering from heat only to benefit the aquarium inhabitants.
1. It generates heat.
2. It consumes as much or more electricity than the AC I use now.
3. Literally no room to put the chiller, already pushing it with the ATO reservoir.
I think my best choice is to be able to control my AC from my mobile phone and be able to program it just like I do with the Apex. It'll be cheaper and it makes more sense than having to buy a chiller.