Should You Use Hot or Cold Air to Defog Car Windows in Summer?
2 Answers
Both cold and hot air are equally effective in defogging, but using cold air is more comfortable in summer while hot air is preferable in winter. Here's an introduction to the car air conditioning system: 1. Overview: The car air conditioning system is a device that cools, heats, ventilates, and purifies the air inside the vehicle. It provides a comfortable environment for passengers, reduces driver fatigue, and enhances driving safety. 2. Classification by Drive Type: Systems are divided into independent (powered by a dedicated engine to drive the compressor, offering large cooling capacity and stable operation but with higher costs, larger size and weight, mostly used in large and medium-sized buses) and non-independent (the air conditioning compressor is driven by the car engine, with cooling performance significantly affected by the engine's operation, resulting in poorer stability, commonly used in small buses and cars).
In summer, window fogging is mainly caused by the large temperature difference between the inside and outside of the car. Turning on the cold air to blow directly at the windshield is the most effective way to defog, as the cold air quickly absorbs the moisture from the humid air. Remember to turn on the external circulation to speed up the exchange of air inside and outside the car. Once the fog disappears, switch back to internal circulation for better energy efficiency. Veteran drivers' experience tells us not to use hot air to defog in summer, as the car interior is already hot enough. Adding more heat will only increase the burden on the air conditioning and consume more fuel. If necessary, turn the air conditioning temperature knob to the coldest setting and adjust the airflow direction to the windshield. You should be able to see the road clearly within half a minute.
