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Answered 2009-11-17 22:12:19

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

A supply duct connected to the return duct somewhere? Fan running backwards?

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A cold air return is similar to a return air grille, which is needed for air to travel to the furnace to be filtered, heated OR cooled and then recirculated.

You feel hot when you have a cold because you are running a fever. You can go from feeling very cold to very hot quickly while you are running a fever.

There should be appx 15*-20* difference between return and supply air temps measured at the unit (not the registers).

You'll get cold... you might get a cold or a sick and cold

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