A useful tip from a friend of mine who works at Bill Barth Ford in Mandan
These days, just about all vehicles have a recirculation button with the AC controls in their cars.   To be honest, I was unsure when to use it.
Well, the easy answer is to use it in the summer and turn it off in the winter
It's really that easy.  The recirculation button simply takes the air from inside the car and recirculates it in the cabin instead of pulling fresh air from outside. On days when it's ridiculously hot and humid outside if you do not recirculate the cooler air in the cabin then your AC system is pulling hot air from outside and trying to cool it. Using the recirculation feature will get your car cooler and will decrease the wear and tear on your air condition system.
On a side note, if your car has been baking in the sun, it's better to roll the windows down and turn the recirculate button off for the first minute or so to get rid of the super-hot air inside the car before turning the recirculate button on.
The recirculation button can also be good for your health
Also, any time you are stuck in traffic ( summer or winter) be sure to use the recirculate. If you are pulling air from outside, then you are pulling in all the pollutants and carbon monoxide from all the traffic. Studies show that recirculating your AC can cut down on the pollutants entering your vehicle by 20% when stuck in traffic!

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