at my old house I had an older fridge (early 90's) that had exposed coils on the back. It seemed to run a lot and I noticed it at night when the rest of the house was quiet. Since I had no money what I did was unscrew the coils and slide some of that foil covered bubble wrap radiant barrier between the coils and the box then I made a small hood for the compressor to "direct" the hot air out to the back not under the fridge. I then used some plastic to make 1/2" stand off's at the bottom and 1" standoff's at the top to move the coil out of vertical. Over all the fridge run time dropped by roughly half but this was all done with me watching a clock, I didn't own a killawatt at that time so take it with a grain of salt.
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