Car sunshades can indeed effectively block heat from entering the car. Their core principle is to reduce the temperature inside the car by reflecting ultraviolet rays and absorbing infrared rays through a physical barrier. Measured data shows that under exposure to intense sunlight, the internal temperature of a vehicle using a sunshade can be about 15°C lower than that without one. Material selection directly affects heat insulation performance. Products made of high-density polyester fibre with special coatings can achieve a 99% ultraviolet blocking rate, while aluminum foil materials perform excellently in summer due to their high reflectivity. The electrostatic adsorption design balances stability and convenience. The installation position of the sunshade also affects its effect. Fitting the sunshade tightly against the car window and sealing the edge gaps can reduce thermal convection. Honeycomb-structured sunshades can further improve heat insulation efficiency due to their air insulation layer design. It is recommended that car owners choose a three-sided sunshade set according to their parking environment. When parking outdoors, they can use it with a sunshade cover. Long-term use not only keeps the interior environment comfortable but also reduces air conditioning energy consumption by about 10%.
