For about $40 or even less you can turn any upright or chest freezer into a temperature adjustable fridge using an STC1000 temperature adjuster . Wiring is easy following this diagram . Just wire up the cold-side leave out the hot and stick the whole thing in a project box and run the freezer through it. I also wired in a fast blow 10A fuse on the phase side. With plugs on both sides you can move it between freezers to make temporary fridges. Very easy and works well. Heaps of info on the web about wiring these up. Mostly home brew guys. I have two upright freezers wired using these as chillers and they work well. The have a soft start function (I set them so the compressor kicks in when the fridge hits 5 degrees then takes it down to 3.5 degrees) so you can be gentle on the freezer compressor. Once everything is down to temperature they only kick in infrequently, so probably pretty good on power too.
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