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  1. #1
    Join Date
    Jul 2007
    Posts
    45

    Can my furnace even support this AC Tonnage?

    I've had three contractors come out and quote systems for me. The first one said 2.5 tons, the second said 3 tons and the last said 3.5 tons. I looked at my furnace and I don't think it will support a 3.5 ton system.

    I have a 6 year old Trane XV90 DY080 (down flow 80k BTU) The inside panel has a table with settings for setting the Tonnage and setting the CFM. My furnace is a downflow and has a * by the 3.5 TON setting and it says "only on the upflow model." I have a down flow model.

    There is also a setting for CFM/TON and the options are 350, 400, and 450.

    So I'm curious what would happen if I went with the contractor that quoted the 3.5TON system with existing furnace would they just say ops, I guess we'll set it for 3 and up the airflow to the 450 and call it good enough, or if they would say, "hey that quote I gave you, tear it up. You need an air handler". Or would the size the coil larger to make up for less airflow to get the rated SEER? Am I overreacting?

    Is the CFM capability of the furnace something they typically check before quoting a system, or was that guy cutting corners?

    Should I call him back and ask or is this a red flag to move on?

    -Jeff

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,760
    On a DIY site. You said your doing this yourself.

    That makes this a DIY question, which is not allowed on this site.

    Thread Closed.
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