Units are made and inserted with descant in the manufacturing process. This is there to take the moisture out of the vacuum sealed unit. After a number of years, or if damaged and not sealed correctly, the descant will begin to fail and the window will become filled with condensation.
You do not need to replace the whole window and frame, it is only the double glazed unit that needs to be replaced restoring the window back to its original state.
The whole process takes approx 3 – 5 days from start to finish, and we supply backed with a 10 year guarantee.
You can see some examples of units we have replaced. The process is the same for broken or cracked windows as it is for misted or steamed/condensed windows/units.