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Window Air or Air Conditioning?

Garlan Garner

Mar 31, 2016
Anyone know which is more efficient in an EV?

Would rolling down the window on the highway be less/more efficient than running the air conditioner?

Anyone have any concrete factual opinions?


2014 S P85 | 2020 3 P19"
Jun 27, 2013
Kansas City, MO
Myth Busters found that using A/C is more efficient at highway speed, but then their testing methodology is often flawed. I think they might have been accurate on this one though.

Yeah...so no. No concrete factual response here. lol.


Active Member
Sep 27, 2016
Bainbridge Island, WA
Best two choices are

1- Fresh Air thru the vents with your windows closed (closed windows better aerodynamics
2- Air Conditioning with your windows closed - same reason as above

How do you decide? based on your comfort level. If fresh air is OK - lowest energy use.

Tesla clubs could run some actual road tests? Is the difference even measurable by mere owners?

Open windows are fine/great when aero doesn't matter ~< 50 kph - like when site seeing in parks.

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