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  1. #1
    Join Date
    Dec 2005
    Newton, NJ

    Change indoor and outdoor or just outdoor?

    Could industry professionals chime in about this? I have a customer visiting this site and would like to see some recommendations other than mine. Thanks in advance.

  2. #2
    Join Date
    Apr 2005
    NE PA
    If you change just the outside unit, you have the following issues: compatibility of the old A/H and compressor; newer unit will be a higher SEER and may further complicate the compatibility issue; line size on the new unit may be larger due to new higher SEER designs.

    To me the issue is always the age of the inside unit. If it is 5+ years old, sooner or later the motor will go, usually there is a rust or corrosion issue with the old coil, and the coil is at an age where future problems could creep up on you. It is usually better to replace both under these conditions. Only if you have a real cash issue would I consider keeping an older coil, and then do some homework on matching and make no promises.

    Since a new A/H adds a chunk of cash to the bill, with duct changes, etc it is a consideration, but as I said usually it is a consideration to keep the old one for a cash strapped retiree or similar situations.


  3. #3
    Join Date
    Feb 2006
    Somewhere in the midwest
    The implications of only replacing the outdoor unit are that you can lose up to 40% of your capacity and efficiency. If you are talking heat pump, the variance in refrigerant charge is a factor also between seasons. A TXV installed in the coil can compensate somewhat for the variance in cooling systems, but if it were a heat pump, forget about it.
    Sound installation practices is the key to success. Equipment is only as good as the person installing it.

    If I can't fix it, it ain't broke.

  4. #4
    Join Date
    Aug 2006
    Pennsylvania / NJ
    Would you change the oil in your car without changing the filter?

  5. #5
    Join Date
    May 2003
    to get the efficiency change both out with a matched system and run a load calc. before doing anything
    It is time for all good men to come to the aid of their country, for we are in deep crap.

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