The air conditioning in your car works similarly to your AC home unit.<br>Credit: Getty ImagesFoggy card windows are synonymous with winter driving. You turn the heat on, and the hot-and-cold mix makes the perfect combo for a cloudy windshield. Yet, the summer can also cause these foggy views. Humidity coupled with blasting the AC creates condensation, which causes the fog. When warm, moisture-filled air comes into contact with a cooler surface, such as your windshield or side windows, condensation forms on the glass. It is the same process that causes a cold drink to sweat on a hot day. During the summer, your air conditioning cools the car's interior and the glass itself. If the outside air is sufficiently humid, moisture condenses when it touches the colder windows.This is especially common in Southern states and coastal areas where dew points stay high throughout the summer months. Even stepping into your car with damp clothes, wet shoes, or sweaty gym gear can add extra moisture to the cabin air, worsening the problem.Humidity And Your WindshieldHumidity is one of the biggest reasons for summer fogging. Dew point, the temperature at which air becomes saturated and water vapor turns into liquid, is used to measure humidity and can indicate how much moisture is in the air. The higher the dew point, the more moisture exists in the air.AdvertisementAdvertisementOn muggy days, the air outside your vehicle contains a large amount of water vapor. If your windshield is cooled significantly by the AC, the warm, humid air hitting the glass's outer surface can instantly create fog. In some cases, you may notice fog forming on the inside of the windshield instead. That usually means the interior air contains more moisture than the outside air.Why Your AC Makes It WorseIronically, the same air conditioning system meant to keep you comfortable can also contribute to foggy windows if it is not balanced properly. Blasting extremely cold air directly onto the windshield quickly cools the glass. When that chilled surface meets warm, humid air outdoors, condensation forms almost immediately. Recirculating air in the car for too long can trap moisture in the cabin instead of venting it out.If your windows fog up frequently, switching your AC from recirculate mode to fresh air mode can help equalize humidity levels. Running the defroster alongside the AC may also remove moisture from the air more effectively.Prevent Summer Window FogFortunately, foggy windows are usually easy to manage. Keeping your windshield clean can help reduce condensation buildup since dirt and residue give moisture more surfaces to cling to. Cracking a window slightly can also improve airflow and reduce humidity inside the vehicle. You should remove damp items from the car whenever possible and make sure floor mats stay dry. AdvertisementAdvertisementIf fogging becomes persistent, it may be worth checking the cabin air filter or inspecting for hidden moisture leaks. Most importantly, avoid wiping fogged glass with your hand while driving. It often leaves streaks that worsen visibility. Instead, use your vehicle’s defrost setting and adjust the temperature gradually to clear the windshield safely.Read the original article on Southern Living
