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    dannac Posts: 267, Reputation: 9
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    #1

    Oct 7, 2013, 04:31 AM
    Trane Heat Pump Hissing Sound
    Though the unit seems to be cooling as normal... my Trane Heat Pump gives a hissing sound when the A/C turns off.

    The noise comes from where the copper lines enter the interior unit.

    The hissing last approx 20 to 30 seconds.

    Any ideas on the cause ?

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