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Thread: Air con vs windows.

  1. #1
    Regular Member jimmyred's Avatar
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    Default Air con vs windows.

    Now the good weather is here, I have been wondering....
    Obviously putting air con on reduces mpg, but is it better or worse than winding down windows? My personal feeling is that at low speeds <30mph having windows open is better choice as far as economy goes, whereas at high speeds its better to preserve the aerodynamics and put air con on. I could have this totally wrong tho......
    Actually as I'm writing this a light bulb has gone on in my head....is that the point of wind deflectors then? So you can open windows without increasing drag?
    Any thoughts?

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    Regular Member Handyandy-UK's Avatar
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    Vehicle : BMW 525i

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    Default

    Mythbusters did one on this ..... granted their results were based on US systems, etc but the result seems plausible enough :

    Up to about 50mph - aircon off uses less fuel as drag from open windows had insignificant effect on mpg

    Over about 50mph - aircon on as closed windows caused less drag

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    Regular Member nokiaman1978's Avatar
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    my aircon is on all the time and easily get 47-48 mpg with hard driving

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    Regular Member byebyeitsagsi's Avatar
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    The larger the engine the less of an impact on mpg is another one. A large engine ticks over with aircon on with ease where as a smaller engine will have more load on it.

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    Regular Member jimmyred's Avatar
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    thats inteeresting . Pretty much how I suspected then. To be honest, neither seems to make that much difference.

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    Regular Member robengland9's Avatar
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    to me its no so much about the mpg....its much quieter with the windows closed.. try to listen to your radio at 50mph with windows open...its not good

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    And switch the radio off for another small saving

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    Regular Member Derek Mc's Avatar
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    I use AC all the time as well as suffering hayfever the pollen filter works very well for me plus I really have never seen a drop in economy.

    I am baffled by people running about with windows open as unless AC ir run regularly it means BIG bills in the short term,,,

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    Regular Member Das's Avatar
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    Even with a 1.8 I have not noticed any drop in mpg using A/C.

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    AiR con all the time for me,my car has climate control so just set the temp and let it do its work

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