Should You Turn on the Heat or Air Conditioning When It Fogs Up on a Rainy Summer Day?
2 Answers
On rainy summer days when it fogs up, you should turn on the air conditioning. Air convection: If the fog is not too heavy, you can also slightly open both windows to allow air convection. This eliminates the temperature difference on both sides of the windshield, making it difficult for fog to form. Turn on the defogging function: To remove fog from the glass on rainy days, you can turn on the defogging function. The air conditioning system will then blow a strong airflow onto the front windshield, and the compressor will automatically turn on, blowing cold air to quickly reduce the temperature difference. Electric heating wire: The rear windshield defogging uses an electric heating wire instead of blowing air. This is because glass with electric heating wires is more expensive and costly. Since the front windshield is more prone to damage compared to the rear windshield, electric heating is generally only used for the rear windshield.
During summer rainy days when fogging occurs, having driven for twenty years, I always directly turn on the cold air conditioning. The cold air effectively removes moisture inside the car, quickly dissipating the fog on the windshield. Using hot air in the hot season makes the cabin even hotter and can increase humidity, which is counterproductive for defogging. I use the defogging mode or manually set the airflow direction to the windshield, combined with the external circulation mode to allow air flow, and it works within minutes. I remember that time driving in heavy rain when the windows suddenly fogged up—switching to cold air immediately cleared my view. Safe driving is crucial, as fogged-up windows can easily lead to accidents. Additionally, regularly cleaning the windows and replacing the air conditioning filter can help reduce fogging.
