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-   -   Sighing noise coming from AC Unit (https://www.askmehelpdesk.com/showthread.php?t=62907)

  • Feb 14, 2007, 01:10 PM
    SageGreen
    Sighing noise coming from AC Unit
    A loud sighing noise comes from our AC Unit. More so when it is extreamly cold or hot. What is this noise?
  • Feb 14, 2007, 02:19 PM
    NorthernHeat
    Heatpump? To nondescript for me to guess.
  • Feb 20, 2007, 01:13 PM
    SageGreen
    Quote:
    Originally Posted by SageGreen
    A loud sighing noise comes from our AC Unit. Moreso when it is extreamly cold or hot. What is this noise?
    Yes, Electric heat pump. The unit outside makes a loud sighing noise like it is being overworked. The emergency heat is not on at this time.
  • Feb 20, 2007, 02:36 PM
    NorthernHeat
    First thing I would check is airflow in the inside and outside units the head pressure may be getting to high due to low indor airflow. If it only happens when the unit first turns on or off that is also a common complaint when the reversing valve changes refrigerant direction flow.

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