When glass sealed units break down they become misty inside, this not only looks un-sightly but it means it is no longer performing from an insulation point of view. Most units are easily replaced, however we will never replace a broken down sealed unit if the window itself is in too old condition or in a poor state as this would be a total waste or your money. We always give an honest opinion with no pressure.
Why Replace Misty Units?
Better insultation of heat
Increased energy efficency
Reduce your energy bills
Remove ugly sight of broken down units
Improve vision through the window