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Windows Down? or Air Conditioner? Whats more efficient?

Discussion in 'Model 3' started by Garlan Garner, Jul 17, 2018.

?

Which is more efficent? Windows down or Air Conditioner ( windows up ).

  1. Windows Down

  2. Air Conditioner

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  1. Garlan Garner

    Garlan Garner Well-Known Member

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    Now that there are many people out there with Model 3's.....which situation do you find to be most efficient?

    Any non-theoretical real world data?
     
  2. fishh

    fishh Member

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    Non-theoretical real world data you say? Mythbusters did a segment on this in 2014, but with SUVs with (probably) less energy-efficient AC compressors than Tesla's.
     
  3. Garlan Garner

    Garlan Garner Well-Known Member

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    Yep....now its time to get the info on the Model 3.....which is totally different.
     
  4. Ejl80

    Ejl80 Supporting Member

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    #4 Ejl80, Jul 17, 2018
    Last edited: Jul 17, 2018
    Normally I like the Mythbusters, but they didn't even swap vehicles and try it again. That could be a bad AC unit, different tires, different driving style, they should try different speeds, etc. However, either way, I'd rather be comfortable and have shorter range.

    This video isn't perfectly scientific, but it shows that once you get to highway speeds, you'll probably want windows up.
     
  5. JADCa

    JADCa Member

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    Above about 30 it's definitely windows up. Tesla electric air conditioning is very efficient.
     
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  6. TaoJones

    TaoJones Beyond Driven

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    Eh. I want my air filtered as much as possible when in LA County. Ergo, the AC is on and the windows are up regardless of efficiency.

    That said, venting the pano can sometimes provide a suitable alternative to using AC. Of course, that might be a tad difficult with a 3.
     
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  7. Stretch2727

    Stretch2727 Engineer and Car Nut

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    Comparison to an ICE car is meaningless.

    The aerodynamics on an EV consume a much larger percentage of the overall energy on an electric car at higher speeds. Aerodynamics is 40% of the losses on and EV versus 15% on and ICE car. So rolling down the windows at high speed will have a much larger impact.

    I wrote this article on the impact of the aero wheel covers.

    Tesla Model 3 Aero Wheel Covers: EV vs. ICE Comparison

    Air conditioning would likely consume approx 1 KW per hour. This would add at most 15 watts per mile at 65 miles an hour.

    The aero loss at speed with window down would be much larger.

    Under 30-40 mph the aerodynamics is insignificant. Here the windows down is more efficient.
     
    • Like x 1
  8. ewoodrick

    ewoodrick Member

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    If the wheel covers are said to add 10% range, what do you think?
     
  9. Garlan Garner

    Garlan Garner Well-Known Member

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    Great info....but some real live comparisons would speak well.

    There are some owners out there that are licking their chops to provide data and shine in the forum. I'm just asking them to exercise a simple experiment.

    To often with Tesla's - real world experience is far different from paperwork figures.
     
  10. Garlan Garner

    Garlan Garner Well-Known Member

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    Lets not think...….that's my point.

    Lets actually see...…..and then report.
     
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  11. seattlite2004

    seattlite2004 Member

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    Not a 3....but Bjorn did some testing with the X:

     
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  12. Adeon

    Adeon Member

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    Can’t vote don’t have car but would like to see results...
     
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  13. ucmndd

    ucmndd Member

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    AC compressor's effect on consumption in my MS is completely negligible, even with temperatures well north of 100F. In fact, that's often when I see my best efficiency.

    It's 2018. There's zero reason to be "that guy" driving around with the windows open on account of "fuel economy" or worrying that your car is going to overheat by the time you get to the top of the hill.
     
  14. Garlan Garner

    Garlan Garner Well-Known Member

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    We are looking for a fact…….

    On the Model 3.
     
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  15. DavidP

    DavidP Member

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    I have found a video from a Model 3 owner doing exactly that experience!



    Like you will hear it's an owner from Québec, so french video. You can check at the end of the video for a table of the results.

    To resume, below 55 mph open your windows, above it use your AC.
     
    • Informative x 1
  16. Garlan Garner

    Garlan Garner Well-Known Member

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    EXCELLENT!!!!!!! Thanks.

    So it appears that the faster you travel.....the more even the power requirements are. Very …. Very …. interesting.
     
  17. Garlan Garner

    Garlan Garner Well-Known Member

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    zero reason?

    Have you thought of them all?

    Let me think..... how many reasons are there that one would want the window down over AC?
     
  18. Bad Horse

    Bad Horse Member

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    I did not suffer through nearly 3 summers without AC to help save up $$ for my Model 3 to give a crap about which one is more efficient. I can tell you which one is much more comfortable though.
     
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  19. Garlan Garner

    Garlan Garner Well-Known Member

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    I suppose it may depend on whether you like AC or not. Some people don't like AC AT ALL.
     
  20. Twiglett

    Twiglett Single pedal driver

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    One thing I have noticed with windows down on my Model 3.
    There is no wind drumming even when the window is all the way down.
    Aero is every good on this car.
     
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