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Refrigerators and freezers have evolved over the years. Refrigerators used to be a box with fiberglass insulation and a huge compressor. They went to better insulation ( foam insulation) to increase efficiency. Then they reduced the size of the compressor so it used less electricity but had to run longer, which is one key to better efficiency, the fewer times a motor cycles the more efficient it becomes, due to reactive energy. Then capacitance was added to balance the load. The capacitor retained the reactive energy produced by the motor and held it until the motor needs it on the next cycle. This process recycles the reactive energy so it doesn't have to get from the power company. An energy star appliance will usually sound very quiet. The refrigerators have started using two thermostats, one for freezer and one for refrigerator to keep a close tolerence on temperature.
Refrigerators and freezers should not be turned on there sides or backs. They have oil in them which can move. Any compressor that has been laid on it's side should stand upright for up to 24 hours before turning on to let oil drain back into compressor.
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