You can remove the sash and bring it to a local glass fabricator. But cutting sealant and reseating a new IGU yourself usually leads to a second failure within a year.
If the window is in an unheated garage, a storage shed, or a historic home where you want to preserve original frames, a broken seal is low priority. The fog won’t hurt anything except appearance. Tape a moisture absorber inside the room and move on. window seal broken
When the hermetic seal around an insulated glass unit (IGU) fails, you don’t get a draft you can feel or a lock you can’t turn. Instead, you get condensation trapped inside the glass, higher energy bills, and a slow path to permanent damage. You can remove the sash and bring it
If your issue was actually about the (the fuzzy or rubber strip that stops drafts) and not the mechanical balance: The fog won’t hurt anything except appearance
To understand the break, you need to see inside the glass. Most windows made after 1980 are double- or triple-glazed. Two or three panes of glass are separated by a spacer—often filled with desiccant (a drying agent)—and sealed around the edges. The air gap is usually filled with an inert gas like argon or krypton, which insulates far better than plain air.