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The refrigerant change of state is what causes the heat transfer. The refrigerant is a low-pressure liquid when it's in the evaporator, which absorbs heat from the air, cooling it. The absorption of the heat causes the refrigerant to boil (change state from liquid to gas). The gas is then brought to the condenser in the front of the car where it cools (rejects heat out) and condenses back to a liquid.

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Q: Why is change of state important to air conditioning?
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