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  1. #1
    Join Date
    May 2008
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    Duct sleeve for condensation

    Hey all,
    so I'm meeting with a Trane salesman and a Rheem salesman today to go over gas furnace + heat pump systems to replace the current 50 year old oil furnace in the new house I've just bought. I've been conversing via email/phone a Bryant dealer. He's been telling me some things that I don't know are true or not, so I wanted to run a few by y'all.

    We were talking about 80% eff furnaces vs. 90+. To me, 80% seems fine for a heat pump that will do most of the work, but he was arguing that the prices aren't very different when you consider that I get a $350 rebate from the gas company for a 90+ and (here's the part I'm not sure about) he said that because the 80% burns at a lower? temperature that I would need to have installed a chimney? sleeve to prevent condensation. Is this bogus or not? Thanks all.


  2. #2
    Join Date
    Jan 2004
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    Your chimney may need a liner for the 80% gas furnace. Very few chimneys don't.

    As weather a 90, or 80% is the wiser choice when going dual fuel. Have your contractors run operating cost comparisons.
    Remember, 10 years from now, gas will be more expensive. And that extra 10% less gas usage adds up.
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    How many times must one fix something before it is fixed?

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