Failed seal / foggy glass
A permanent haze, streaking, or visible moisture trapped between the panes that no amount of cleaning touches.
- What is happening: The insulated glass unit is two or three panes bonded around a spacer with argon sealed inside. When that perimeter seal fails, the argon leaks out and humid air leaks in. Every freeze and thaw cycle works that seal, which is why we see so much of this in Northern Minnesota.
- How we handle it: In most cases we replace only the glass unit and reuse your existing sash and frame. That is a fraction of the cost of a new window, and it restores the insulating value. If the sash itself is failing, replacement becomes the better answer.