A glazing consists of single panes of glass, which tend to fog more when warm, moist air hits the cold glass pane directly. If the glass is very cold and you open the door from the apartment, the glass fogs up on the inside. A facade is never completely sealed, and especially in older houses, both moisture and heat leak out, which is captured by the glazing. It is for this reason that a glazing should never be completely sealed, but a ventilated space so that the facade is not damaged by moisture. If you have glazing from us, you don’t have to worry about it being too tight because our glazing is always installed with regard to the facade and in accordance with the best practices However, our glazing also fogs up when it’s cold outside and warm, moist air hits the glass. The phenomenon of fogging on the inside of the glass is also common in, for example, cars. In exactly the same way that you start the fan in the car and turn on the heat to remove the fog on the glass, you can add a heat source or heating fan on the balcony or patio if you want to avoid fogging up on your glazing.