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Thread: Furnace size

  1. #1
    Join Date
    Nov 2005
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    How do we know what size furnace we need and/or if we are being oversold? We live in western Oregon so have a fairly mild climate. Our house is 1950sf, one level, built in 1983, with the original 80,000 btu Borg-Warner furnace. We have vaulted ceilings in the combined family room/kitchen area. We have updated with vinyl, low-e windows with argon; added floor insulation (R21); wrapped furnace ducts; replaced doors with energy efficient doors; and have original R-11 walls and R-30 ceiling. It has been recommended that we should have a 90%, 2-stage furnace with variable speed blower. Two contractors recommend a furnace with a BTU output capacity of 74,000; another recommends 56,000. We need help sorting this out.

  2. #2
    Join Date
    Jun 2000
    N. W., IN
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    Thumbs up

    go to top right of this page for HVAC CALC

  3. #3
    Join Date
    Apr 2003
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  4. #4
    Join Date
    Jan 2004
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    As the others said, do your own load calc.

    I bet the guy that said 56000, is right.
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    How many times must one fix something before it is fixed?

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