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  1. #1

    replacement for Lennox 2-stage HS21

    My Lennox HS21 two speed 5-ton unit died a couple of months out of warranty.
    The inside unit is (I assume) in great shape (Harmony-II 3-zone). What would be a compatible / recommended replacement?

    One contractor is recommending a Trane XR14, which I'm leaning against both because I'd prefer a higher efficiency unit and a two-stage.

    So...
    is installing a single-stage A/C a really bad idea?
    can the existing air handler be used with the new R-410A A/C's?

    Thanks

  2. #2
    Join Date
    May 2008
    Location
    smalltown VA
    Posts
    15
    One contractor is recommending a Trane XR14, which I'm leaning against both because I'd prefer a higher efficiency unit and a two-stage.
    Ask for a higher efficiency system quote.

    So...
    is installing a single-stage A/C a really bad idea?
    If you've had a two stage system, then installing a single stage system will likely increase your electrical consumption.

    can the existing air handler be used with the new R-410A A/C's?
    NO!

  3. #3
    Join Date
    May 2007
    Location
    DC Metro Area (MD)
    Posts
    3,371
    It's best to replace both the indoor and outdoor units at the same time to ensure efficiency and to avoid future problems down the road. Good luck. You really should be looking into getting matching air handlers.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,123
    Get a quote on a Lennox XC21
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,744
    what is model# of existing air handler??

    could be a rated match with lennox xc16 or xc21 if not to old, would have to replace the txv.

  6. #6
    Join Date
    Mar 2008
    Posts
    657
    yeah i agree with beenthere get a quote on the xc21.
    "The things you own end up owning you. "

    Tyler Durden

  7. #7
    Join Date
    May 2002
    Location
    Houston Texas
    Posts
    6,323
    The HS21 is an R-22 unit so the air handler would not be a good match for an R-410A condenser.

    Check out the Trane or American Standard 18 SEER two-stage unit they are R-22 and work fine on the CB32 MV AH. I have done this in the past when the HS-21 coils have failed without any problems.

  8. #8
    Quote Originally Posted by t527ed View Post
    what is model# of existing air handler??

    could be a rated match with lennox xc16 or xc21 if not to old, would have to replace the txv.
    The air handler is CB31MV-65-1P

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