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How does it dehumidify the air?
Warmer air will basorb moisture from the surrounding air and have the same relative humidity as its surroundings. But because it is warmer, it has more capacity to hold water. So the water content will increase.
If it is just passing by getting heated then total water content stays the same but the relative humidity (amount of water / capacity to hold water) decreases. When you cool it down to its original temp you are back to square one minus the energy needed to cool it.
Atleast that is my understanding.
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