Stopping windshield fogging?

Question

When I drive my car in the winter and then drive it underground to park it, as soon as I get underground to the warm air, my windshield fogs up and I can't see out of it. Do I turn on the Air Conditioning, Heat or open the windows to get air moving in the car so that it de-fogs quickly?

Answer 1

Turn the ac on with the heat and defrost

Answer 2

You should have a windshield defroster setting in your car.  This directs the air at full force from the top dash vents towards your windshield.  If your car doesn't automatically adjust the temperature as well as the direction, turn the heat on as high as it will go.

Answer 3

turning on the heat will defog it.

Answer 4

Turning the A/C on and switching the controls over to defrost just before you enter the parking lot will remove all of the fog very quick.