Most cars have this button, but few know when to use it

(NEXSTAR) - An often overlooked button on your car or truck's dashboard could be saving you some sweat and money.
The air recirculation button is usually found near the rest of your AC and heat options. It's typically depicted as the outline of a car with a looping arrow inside. You've probably seen it, maybe even pushed it, but do you know what it actually does?When activated, the vehicle will recirculate the air that's already inside of the car instead of pulling in fresh air from outside. It'