Another consideration is the level of comfort. With the windows open, outside noise, dust, and pollutants can enter the cabin, diminishing the benefits of running the AC.

You might be surprised to see large passenger airliners with cockpit windows that open. Here's why some cockpit windows open, and how it's done safely.

Time to roll down those windows and sing at the top of your lungs ... “You can adjust the frequency of the sound body by ...