To begin with, driving with the air conditioner turned on and the window open at the same time is irrational. The first cools the interior, the second provides access to an unlimited amount of warm air from the outside. You already decide whether you are hot or cold.
Some, however, are uncomfortable without an additional influx of fresh (albeit very conditional) air from the street. In this case, you can open the window for ventilation: it will not be worse from a click. Although the risk that blows you remains even with the sweltering heat outside.
And the correct answer to the question from the title depends on what system is installed in your car.
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How does the air conditioner work and what threatens to turn it on in winter? A simple manual air conditioner is not trained in automatic behavior. What speed, flow directions and temperature the driver sets, those settings will be saved for the whole trip. Regardless of what is really going on in the cabin! Such a system does not have a temperature sensor. And without him, she is not able to understand that her efforts were nullified by open windows.
Only the owner can screw up the air conditioning compressor with excessive load on it, constantly setting the maximum fan speed and minimum temperature. Open windows are not at work. However, with this approach, most likely, "konde" will not have to work long - the owner will go to bed for health reasons.
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6 examples when a simple air conditioner is better than climate control Another thing is climate control. In automatic mode, he analyzes the temperature overboard and in the cabin (the trickier the model, the more sensors). With the same settings and a cabin isolated from the external environment, the system will work with much lower intensity than when the windows are open. Do not believe? Press the “Auto” button and compare the fan speed (it usually appears on the display) in both cases: open and closed window.