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Thread: Furnace size?

  1. #1
    Join Date
    Apr 2008
    Posts
    31

    Furnace size?

    Yeah I would like to replace my furnace. The gas input on the old furnace is 80,000 btu. It is a 80% furnace. Now, I was wondering if I could get a 95% two stage furnace with 70,000 btus? Will it still heat the house good?

    Also, I live in North Carolina what do you think about putting a 95% furnace in the attic?

    Thanks

  2. #2
    Join Date
    Feb 2007
    Posts
    999
    Quote Originally Posted by lowridemazb2200 View Post
    Yeah I would like to replace my furnace. The gas input on the old furnace is 80,000 btu. It is a 80% furnace. Now, I was wondering if I could get a 95% two stage furnace with 70,000 btus? Will it still heat the house good?

    Also, I live in North Carolina what do you think about putting a 95% furnace in the attic?

    Thanks
    Your current furnace (when new) delivered 64,000 btus. The 95% furnace will deliver 66,500 btus. Assuming your current furnace is correctly sized, this would be a good match.

    A 95% furnace can be vented through the roof. If your current furnace and ductwork are there, no problem.

    AM

  3. #3
    Join Date
    Mar 2008
    Location
    Grundy Co. IL
    Posts
    773
    Not a problem putting it in the attic, as long as you don't have extended days below freezing.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,743
    You can install a 40,000 BTU 95% furnace and it will still heat the house. How warm it will heat the house is the question.

    Don't get a 2 stage because you think it will save yoou more money then a single stage. It won't. It will provide you with better heating comfort most of teh time though.
    There are freeze conditions that need to be addresssed when installing a condensing furnace in an attic.

    Have a load calc done. You may only need a 60,000BTU 95%.
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