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The compressor does all the cooling. Those set points only control the air movements from the cooling coil area to the freezer or fridge side. So! you adjust the airflow for more or less cooling in either section and too cold in both - raise the temp. Too hot in both raise the temp setting - not the air control.

A more technical explanation

The freezer is located above the refrigerator portion, and warmer air rises. So the colder air would naturally sink to the refrigerator. However, there is a vent of a calibrated size or a damper door you can adjust to only let so much of the cool air down at a time. The thermostat is in the refrigerator, since that is where the exact temperature is more crucial, but the evaporator coils are in the freezer for the most part. There might be an extra loop of the coils in the refrigerator portion in some models, but most of the cooling takes place around the freezer box. If you have a freezer control, then that is just a door between the two cavities.

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Q: In a double door fridge set points are there in both freezer and cooler sections but you see only one compressor How does this single compressor operate for two different set points?
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