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Fridge
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The pieces of refrigerators that have failed me in the last 15 years have been the plastic parts. A small improvement in plastic quality or engineering seems like it could double the life of the refrigerator. And of course a small plastic replacement part costs $50 or more.
My last fridge, something in the compressor failed; it would have cost almost as to fix as replace.
But maybe fridges aren't the same as AC units and heat exchangers. If I knew that, I could probably have fixed my fridge myself :-/