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Thread: A/C Duct Locations

  1. #1
    DIY Senior Member seaneys's Avatar
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    May 2007
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    Chicago Suburbs
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    Default A/C Duct Locations

    Hello,

    We're doing an addition to our 1911 bungalow with hydronic heat. I have not included A/C in the plans, but would like to put in the duct work while the walls are open. We do not have any duct work in our house a the present time (radiators).

    Are there any books or guidelines for duct locations and sizing? It is a one story house (main floor and basement). I'd love to just put the A/C supply and return ducts in ceiling later.

    Thanks,
    Steve

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Sep 2004
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    New England
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    Default

    I'd consider the smaller, high-velocity ducts. This will limit you to an air handler designed for that, but in a retrofit, it makes some sense. The duct work is very small and the outlets unobtrusive.

    You'd need to either do or have done a heat load analysis which will tell you the size of the a/c unit you need and how many CU FT/min of air movement you need as well. Then you can have the ducts sized.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

    Default

    Quote Originally Posted by jadnashua
    I'd consider the smaller, high-velocity ducts. This will limit you to an air handler designed for that, but in a retrofit, it makes some sense. The duct work is very small and the outlets unobtrusive.

    You'd need to either do or have done a heat load analysis which will tell you the size of the a/c unit you need and how many CU FT/min of air movement you need as well. Then you can have the ducts sized.
    A long with that you want your vents to be on the ciling or high on the walls.

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