There is anecdotal evidence that magnetic treatment can help the refrigeration process.

A butcher's shop had magnetic fuel treatments unit fitted to four refrigerator circulation systems.  

One is shown opposite.

The units were on:

A freezer room

A cold room,

Chiller display cabinets and

Refrigerator and freezer cabinets

Electricity consumption was monitored over a six month period and showed a consistent reduction of 11%.

I can see possible mechanisms for the other magnetic applications, but this one has me stumped.

If anyone can suggest a mechanism, I'd like to hear it.