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Sunroof vs Climate Control - Efficiency

Discussion in 'Model S' started by Pipcecil, Apr 4, 2017.

  1. Pipcecil

    Pipcecil Member

    Joined:
    Feb 21, 2017
    Messages:
    50
    Location:
    Midlothian, TX
    Has anyone looked at the efficiency of using climate control versus opening the sunroof and creating extra drag? I was just curious. I know it depends on many factors (speed, outside temp, climate control temp), but lets look at a typical situation:

    60's outside (ideal for sunroof)
    Speed at 55 mph
    Interior CC set at 72 on all auto (so this would result in some light heating but not a lot).

    Would the additional drag made by the sunroof be more than the energy required to keep up the climate control? Has anyone looked into this?
     
  2. boonedocks

    boonedocks Member

    Joined:
    May 1, 2015
    Messages:
    698
    Location:
    Gainesville, GA
    I use climate control so much that I opted for the all glass roof on my 100D. For me it's not just climate control but also contagent control. All the outside yeck from exhaust to pollen to dust To road debris blowIng around and the NOISE that I just don't enjoy a sunroof at all.
     
  3. bob_p

    bob_p Active Member

    Joined:
    Apr 5, 2012
    Messages:
    1,562
    Having the sunroof and/or windows open creates drag - and probably would have a greater impact than interior climate control. And if the outside temperature is close to your desired inside temperature, the interior climate system shouldn't have to do much work anyway.

    I think someone researched this years ago and concluded windows/sunroof closed was more efficient - but near as much fun...
     
  4. David99

    David99 Active Member

    Joined:
    Jan 31, 2014
    Messages:
    2,568
    Location:
    Brea, Orange County
    It actually used to be on Tesla's website included in the range calculator. You could turn on/off the AC and open or close the windows and see how it affects the range. The sun roof alone probably makes little difference. But rolling down the windows definitely causes more air drag and energy than keeping them closed and the AC running. Even in high temperatures. The AC on the Model S/X is very efficient. If you like your windows open, do so, it;s fun. If you try to conserve energy, close them and use the AC.
     
    • Informative x 1
  5. cryptyk

    cryptyk Member

    Joined:
    Jul 8, 2015
    Messages:
    339
    Location:
    United States
    I use the sunroof every day. Love it. I definitely notice the impact on range on the mornings I leave it open the whole way to work vs. using the ac.

    The difference in efficiency is largely from speed. At 3mph, the sunroof is more efficient. At 90mph, the ac is more efficient.

    My commute is on the freeway, but I still love having the sunroof open, efficiency be damned.
     

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