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  1. #1
    Join Date
    Mar 2012
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    KW cooling or KW electrical consumption

    Hello all, I believe I am limited to posting here as I am such a newby..

    Anyway, if I have a 3.5ton airconditioner it will use approx. 6KW of electricity when running.

    3.5tons is 42,000 BTu which equates to (42,000 / 3412 = 12.3KW)

    Why is my KW cooling different to the KW consumed and what laws/rules should I be looking up so I understand this better.

    Electrically I am squared away but this problem has always just been out of my reach...

    Thanks for any help you can offer to guide this newby to what is probably the most obvious thing (when you know where to look)


  2. #2
    Join Date
    Sep 2008
    Western PA
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    It is easier, work wise, to move heat than to create it.

    The formula you are using is a direct electrical relationship of kw to BTUs. This would only be accurate for using an electric heating appliance.

  3. #3
    Join Date
    Jan 2001
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    If you are a HVACR student or a rookie, you have arrived at the point where you need to research COP (Coefficient of Performance) and EER (Energy Efficiency Ratio).

    PS: Get your pro status and ask your questions in a Pro catagory and you can get more details in the discussions.
    Last edited by Tom R; 03-21-2012 at 04:01 PM. Reason: added PS

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