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Originally Posted by cRiPpLe_rOoStEr
In the end it didn't save much on the electricity bills when I last saw anything about that.
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No it wouldn't save much money because refrigerators don't use much electricity - especially small to medium size ones that are used in most of the world. The 74L fridge I bought for the ambulance has used 1.14 kWh in 4 days of testing. Even if someone could recover all of that energy as waste heat it would be pennies a week.
Recovering waste heat from A/C doesn't make much sense on a small scale. It could have reasonable savings at a commercial scale. For example some server farms are heating hot water with some of their waste heat from running their huge A/C units. They are also experimenting with using that waste heat to provide heating for other buildings.