Modern uPVC windows have such high air impermeability and are sealed so tightly to the building structure that no natural air exchange can take place.
Proper ventilation using modern windows can help to save heating costs and create a healthy room climate at the same time.
Cross ventilation through two opposite windows is especially quick and effective – one single open window sometimes is not enough.
Keeping the window open for 5 minutes is sufficient to replace the indoor air.
For a more thorough airing of the rooms, open the windows wide for 10 minutes.
You will achieve the best results by ventilating your home three to four times a day.
However, it is important to make sure the flow of air is not obstructed in any way (by furniture, for example). Ventilate kitchens and bathrooms more frequently as moisture levels tend to increase due to cooking, bathing, taking a shower, etc.
As a general rule of thumb: If your window is fogged up, then it's time to ventilate.
To facilitate ventilation, Basic Air plus® or REGEL-air® ventilation systems can be installed in the window.