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Standard refrigerators use compressors to circulate freon through coils located in the freezer comparment and under the unit near floor. The freon absorbs heat in the freezer compartment and sends it by tubing to the coils near the floor where it releases heat. The thermosat tells the compressor when to turn on. The freezer comparment will be cooled down to about zero degrees. The refrigerator gets its cold air from the freezer.Their will be a dial in the refrigerator which will open and let in a certain percentage of cold into the refrigerator. The air is moved by a fan. The coils in the freezer will collect moisture from the system and frost will collect. To increase efficiency the coils should be defrosted. Self defrost refrigerators will have heater elements to melt this frost. When this happens you will hear a faint dripping noise and maybe a popping noise. This will cycle on and off with a defrost timer. Fans you hear are recirculating air in the box.
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