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    lance29 Posts: 1, Reputation: 1
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    Jul 24, 2012, 08:46 AM
    Furnace 4 yrs old began rattling sound then changed to muffled sound after 2 days
    My gas HVAC Goodman furnace started making loud rattle sound. After a couple of days changed to a muffled sound. When starting up on AC it sounds much louder then goes into the muffled sound. What could this be? Unit is 4-5 yrs old. Noise in coming through return.

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