Here is a link to a DIY, through wall, refrigeration cooling unit.  Could be mounted under the
sink (into the side of the existing fridge, or the fridge could be taken out, insulation put all
round and re-installed.

I ASSUME that this is a 12v system (it does have an AC adapter).  No propane.  I bought a Waeco
cooler-style AC/DC fridge and I'm real happy with it.  I have no connection to this company.  m

http://ca.binnacle.com/product_info.php?cPath=7_307&products_id=5853

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