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  1. #1
    Join Date
    Jul 2006
    Posts
    6
    Hey all-

    Thanks for the information.

    I've seen in other posts that the SEER rating drops when the air handler/evaporator coil is in the attic. Is that because of the heat in the attic sapping some of the chill out of the system before it even gets into the house, or is it because the system is a HV tube system?

    I am in an older 2 story home (vintage 1968) and the original AC compressor finally died (I'm sure it can be repaired, but on another thread it's estimated to be below a 5 SEER), so I think that it's time for a new one.

    I have seen specs for systems that have SEER ratings near 20 (TRANE XL19i), and many more in the 14 to 16 range. At what point does one typically hit the law of diminishing returns? I tend to be a techno-nut and want to make sure that I don't let myself get talked into something that is the Ferrari of AC. We plan on being in this house for at least another 15 years - so I don't mind spending the "Right" amount, I just don't want to get real stupid with cost.

    Thanks.

    JTL

  2. #2
    Join Date
    Nov 2005
    Location
    Kansas
    Posts
    4,417
    You can calculate your savings, the links below will explain some of your questions.
    http://en.wikipedia.org/wiki/Seasona...iciency_Rating
    http://www.advancedenergy.org/buildi...s_bulletin.pdf

  3. #3
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,182
    Key is the ARI rating. http://www.aridirectory.org

    I found only 1 rating for a XL19i on a Space Pak and that is a 5 ton outdoor unit. It gives an efficient 13.2 SEER and 49,500 BTU rating. Same way using the Lennox XC21 super efficient unit.

    Yes, attic heat penetrating the ducts kills capacity but that isn't reflected in any rating.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,104
    Originally posted by BaldLoonie
    Key is the ARI rating. http://www.aridirectory.org

    I found only 1 rating for a XL19i on a Space Pak and that is a 5 ton outdoor unit. It gives an efficient 13.2 SEER and 49,500 BTU rating. Same way using the Lennox XC21 super efficient unit.

    Yes, attic heat penetrating the ducts kills capacity but that isn't reflected in any rating.
    Wow, 13.2, and only losing 1 ton capacity.
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