Two problems you will run into here:
1. Air is a poor conductor of heat and cold
2. The mini fridge has a low capacity to remove the heat.
If you have much demand on the "glycol" then the fridge will not be able to keep up. Depending on the application this could work. But there are a lot of variables at play here.
You would probably be better off buying a small AC unit off CL and hacking it up into a DIY glycol chiller. I use something like that and it works really well. I set the glycol bath to 25 and I have full control of my fermenter.
*Everything I say is fully substantiated by my own opinion
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