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A bigger problem is pure and simple BTU's --- look at how many BTU's most chillers or even AC units handle - that's how much cooling they can provide. A typical small AC unit is about 5000 BTU - a typical small fridge is about 150 BTU if I recall correctly.

Refrigerators and freezers are not designed for high BTU output, instead they are designed for insulation and gradual cooling. The also are not meant to be running non-stop.

I'll see if I can dig up some links, there have been a ton of articles on this, as well as much debate amongst the reefing community over the past 20 years or so. This is something a zookeeper and I researched back in the early 90's, when we were considering adding a tidepool tank with cold-water animals to the zoo.

Ah, here we go.
not the only link out there by any means, but pretty informative:

Unless the tank is very small, the desired temp change is small, and the heat input is low (not alot of powerheads or other submerged pumps, and very cool lighting), a fridge style unit just won't keep up.

evaporative cooling is a better option - one gallon of water evaporated from the tank can provide something like 5000+ btu of cooling, if I recall correctly, and fans are cheap and easy to use.
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