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You will hear air circulating in the cold air return (or return air grille) when the heater or air conditioner is running.

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โˆ™ 2009-11-17 22:12:19
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Q: Should cold air return be running constantly?
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Your sense of taste (and smell) should return naturally after recovering from a cold.

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Obviously you have a cold if you are constantly blowing or you have something spicy or you are crying

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Food should be defrosted in the microwave under cold running water or?

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is your fan running in the correct direction? are any of your ducts blocked?

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It is never a good idea to restrict or block a cold air return.

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