Why does the balcony glass heat up if it is covered with film?

Because the metal layer in the heat insulation film adsorbs the heat, the temperature on the film is relatively high.

1. This is normal. The feeling of stuffiness in the car is because the temperature outside is too high, and the heat enters the car (there are 3 ways of heat conduction, which should be known to everyone). Although the car is covered with film, the heat insulation rate of the film is only tens of percent, and when the outside temperature is higher than the temperature in the car, some of the heat will enter the car.

2. In addition, other parts of the car will also have heat in: for example, under the shock absorption, the roof of the car will transfer heat in. In a word, if any car sticker or film is exposed to the scorching sun for more than 50 minutes, the temperature inside the car is basically the same as the outside world.

However, with a good quality film, it only takes a while to hit the air conditioner, and the temperature will drop down soon.

3. On the contrary, it is always difficult to lower the temperature of the film that is not attached to the film or has poor quality, because the heat from the outside keeps coming in, and the air conditioning in the car is constantly emitting outward. This is also the principle of winter insulation with a good film.

4. As for touching the glass outside, it is normal to have hot hands. Because after the film, the film has the effect of blocking heat, and the heat that should be transmitted into the car through the glass is blocked by the solar film on the outer layer of the film, that is, on the glass, and the heat gathers on the glass for a long time.

Do you mean glass or room temperature?