What Causes Condensation Inside the Car in Summer?

[CarmenFitz]

Condensation inside the car in summer is caused by temperature differences. Temperature difference leads to dew formation: When the humidity in the air is constant, if the temperature of the car window is lower than the dew point, dew will form on the surface of the window. This is the fogging phenomenon often seen on the windshield. Temperature difference leads to fog formation: When there is a certain temperature difference between the two sides of the window, and the saturated vapor pressure of the water on the cooler surface is lower than the vapor pressure of the surrounding environment, water vapor will gather on the glass surface and form tiny water droplets, resulting in fog. Solution using air conditioning cooling: Use the air conditioning's dehumidification function to reduce air humidity and remove fog. Solution using air conditioning heating: Blow warm air onto the glass to quickly raise the temperature of the windshield and reduce the temperature difference between the inner and outer surfaces of the window, preventing excessive fogging on the windshield. The main reasons for condensation inside the car are high humidity inside the car and low temperature outside. In summer, especially when multiple people enter the car and the air conditioning is not turned on promptly, the high humidity from exhaled breath can quickly cause fogging on the windshield. At this point, you can turn on the air conditioning to blow cold air onto the windshield and use the dehumidification function to remove the fog on the windshield quickly.