Wipe the inside of the window. If the moisture is on the surface, it’s fine. If you wipe it and it remains "foggy" or wet inside the two panes, the insulating gas (Argon) has escaped and air has replaced it. The window is no longer energy efficient.
You touch the pane. It’s smooth. The crack is on the inside—but between the two sheets of glass.
Estimate the for a replacement unit based on your window size double glazed window cracked inside
The heated center of the glass expands, while the edges (tucked into the cold frame) stay cool. This tension eventually causes the glass to snap.
Finding a crack on the inner pane of your double-glazed windows is frustrating and confusing. Since the outside glass is perfectly fine, it often feels like a mystery. Most homeowners assume someone hit the window, but inner-pane cracks are usually caused by invisible forces like temperature shifts or pressure. Wipe the inside of the window
A double-glazed window with a cracked inner pane can be a bit of a challenge. Here are some possible causes and potential solutions:
If the window frame was slightly twisted during installation, it puts constant pressure on the glass. Eventually, that pressure causes a fracture. The window is no longer energy efficient
You will likely see fog or moisture building up between the two panes of glass. This cannot be wiped away and will eventually lead to calcium deposits (white streaks).