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  1. #1
    Join Date
    Jun 2007
    Posts
    21

    Furnaces less than 60,000 btu qualifying for the tax credit?

    What brands of furnaces less than 60,000 btu qualify for the tax credit?
    Two stage preferred.

    I need to do a heat loss study but so far I have been offered everything
    from 45,000 btu size to 70,000 with nothing less than 60,000 which
    qualifies for the tax credit.

    Norm

  2. #2
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,608
    is this heat only or is with a ac unit

  3. #3
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
    Posts
    4,570

    get a modulating furnace if you can afford it.

    Aire Serv of SW Connecticut- Gas heat, dual fuel and central a/c systems installed and serviced

  4. #4
    Join Date
    Jun 2007
    Posts
    21
    is this heat only or is with a ac unit?
    Replacing the heat, keeping the existing ac.

    Norm

  5. #5
    Join Date
    May 2002
    Location
    Houston Texas
    Posts
    6,316
    Quote Originally Posted by normnet View Post
    What brands of furnaces less than 60,000 btu qualify for the tax credit?
    Two stage preferred.

    I need to do a heat loss study but so far I have been offered everything
    from 45,000 btu size to 70,000 with nothing less than 60,000 which
    qualifies for the tax credit.

    Norm
    Godman GMV90453 96% lifetime heat exchanger warranty

  6. #6
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,240

    Question Alternatives

    Quote Originally Posted by normnet View Post
    Replacing the heat, keeping the existing ac.

    Norm
    Would a heat pump be of interest and a possible, sufficient system solution?

    How old is the equipment?

    You did not provide your locale.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  7. #7
    Join Date
    Jun 2007
    Posts
    21
    Would a heat pump be of interest and a possible, sufficient system solution? You did not provide your locale.
    Not likely, MN location.
    -20 degrees not unheard of.
    Have seen a few -40 degrees but dead calm.
    -40 no different than -20 for house to car and car to work.

    How old is the equipment?
    The furnace to be replaced is 27 years old.
    It is a Lennox G12D2E-82-6 with input of 82,000 btu.
    The output is 55,760 btu.
    A new 95% 60,000 would be 57,000 btu output but the old furnace could
    be well over sized.
    If their are any furnaces less than 60,000 btu which qualify for tax credit
    I plan to do a heat loss study.
    No Luxaire dealers in area.

    The other option is a modulating gas valve.
    The Rheem system would seem to be potentially the best as it
    communicates with the furnace more than on/off hopefully adjusting gas
    valve based on temp differance from set point.
    The Rheem however doesn't qualify for tax credit.

    The York uses a standard stat and calculates when and how to run.
    I think this would be 2nd best to actual temperature measurement and
    rate of fall a dedicated stat could provide.

    The Lennox modulating furnace uses a standard 2 stage furnace with 2nd
    stage determining when to go to high fire.
    This would be at 2 degree's less than set point, a dedicated stat could do better.

    If I were to design a modulating gas valve thermostat (no way I will because of dangers
    with gas) it would adjust flame size by use of a PID (proportional integral derivative) control.
    See http://www.parallax.com/dl/docs/books/edu/ic.pdf page 145.
    P is for proportional adjusts flame size by percentage from set point. 0-100%
    I is for integral increments flame size over time to ensure completion of cycle.
    D is for derivative dampens flame size to prevent over shoot and hunting.
    The formula could also be self learning by reading for several minutes after completion
    for over/under shoot and correct factors in the PID.
    The stat sensor would be located outside the enclosure to get most accurate reading.




  8. #8
    Join Date
    May 2008
    Location
    Missouri
    Posts
    3,422
    I don't know of anyone making a 95% plus furnace smaller than 45,000 BTU, however you should be able to find plenty of these units! Yes, I'd have a heat loss figured, and go from there! Or you could go with the 70K and get a two stage unit!

  9. #9
    Join Date
    Apr 2007
    Location
    Pa,
    Posts
    106
    The Federal Tax Credit is based on AFUE ratings of any given furnace, any manufacturer and not on the btu capacity of that furnace. It must be rated at least 95% Annual Fuel Utilization Efficiency, to qualifly for the Federal Tax Credit.

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