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    hdnvn's Avatar
    hdnvn Posts: 1, Reputation: 1
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    #1

    Nov 25, 2007, 03:56 PM
    Calculating ac/heat for my house
    I have one furnace in my 5000 square foot houswe and want install an additional unit for the upstairs, separating the house into a split system. How do I go about calculating for this? I want gas heat and AC in the attic to supply the entire second floor. Thanks
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Nov 25, 2007, 04:12 PM
    It's not as easy as it seems. This should answer your question. HVAC Software, HVAC-Calc for Heat Loss, Heat Load Calculations

    What your looking for is called "Manual J" calculations.
    "Manual D" calculations are use for duct design.
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