Switching PVC windows to winter mode is straightforward. It involves adjusting the sealing mechanism. Locate an adjustment roller or a metal pin on the frame of the movable part of the window, which becomes visible when opened. This pin helps to adjust the window’s tightness based on your needs.

To set the windows to winter mode, tighten the screw on the frame by about 90 degrees. This can usually be done with your fingers, pliers, or a special key, depending on the window model. When the weather gets warmer, simply loosen the screw to switch back.

Winter mode in windows means pressing the seal more firmly against the window frame, reducing the amount of fresh air entering your home or building. While this function has its advantages and disadvantages, one key benefit is the reduced risk of allergies due to better air circulation.