What type of air should be used to defog windows when it rains?

[StJude]

When windows fog up in the rain, use warm air to defog them. The method is to first turn on the air conditioning, adjust the temperature to the warm air setting, and switch the air conditioning to the defog mode. The warm air produced by the heater will dry the fog inside the car. This way, not only the front windshield but also the side windows will quickly clear up. When defogging, be sure to switch the air conditioning to external circulation to allow fresh air from outside to enter the cabin. Setting the compressor and fan speed to the highest level can speed up defogging. If the side windows are not clearing fast enough, it's best to close the two central vents to direct more airflow to the side vents, which will help disperse the fog more quickly. You can also slightly open the windows to accelerate defogging.