double Glazed window repairs (www.stes.tyc.edu.tw) Over time, double glazing may develop problems such as mist between glass or decaying frame. These issues are easy to fix and could be cheaper than you thought. Check with the company where you purchased the item to determine if there is a warranty. It's worth trying to fix any issues yourself first. Sealing Window seals, referred to as upvc window repair window seals, play an an important role in the insulation of double-glazed windows. Seals that are not properly maintained can cause condensation, drafts, and other issues. Fortunately, damaged seals can be replaced or repaired to improve the effectiveness of your double glazing. The most frequent indication that your double glazed windows require sealing is water leaking between the glass panes. This moisture can damage your window frames and increase the cost of energy. Moisture in between glass frames can cause a foggy look that can come and go in accordance with temperature and humidity levels.