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  1. #1
    Join Date
    Jan 2006
    Location
    upstate
    Posts
    19

    Sizing Residential a/c

    Can anyone give me some good advice on sizing a residential central air system

  2. #2
    Join Date
    Mar 2008
    Location
    Grundy Co. IL
    Posts
    773
    Quote Originally Posted by coolsteve View Post
    Can anyone give me some good advice on sizing a residential central air system
    Manual J

  3. #3
    Join Date
    Jan 2006
    Location
    upstate
    Posts
    19

    Book or program

    Do I need to spend the $ 50 or are there alternative prorams or literature

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,880
    There are far more expensive programs then the HVAC CALC. That you can use.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,967
    I always advise everyone to do everything possible to reduce the heat-gain heat-loss before you do the manual J calc. Then down-size as much as possible, within limits.

    We could cut residential heating and cooling equipment size in America by 30% to 50% if Contractor's would perform accurate Manual J calculations and provided full credit for every load reducing element or detail they can when doing the calculation audit. Additionally, load reduction remedial actions should be provided as options toward further reducing Air Conditioning and heating equipment sizing.

    Down sizing has many advantages; the existing duct system & air handler will function more efficiently helping to achieve the unit's nominal tonnage capacity with less than peak heatload conditions. That improves EER & SEER performance.

    You might be amazed at what a fully functioning system can cool. I cool perfectly nearly 900sf first floor of an old 1937 farm home with a Half-Ton 6,000-Btu/hr window unit.

    http://www.udarrell.com/airconditioning-sizing.html
    - udarrell

  6. #6
    Join Date
    Sep 2002
    Location
    I don't know
    Posts
    2,903

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