A broken window seal causes foggy glass and heat loss. Here’s how to fix it.
What Causes It? Failed rubber seal between double-pane glass allows moisture in.
Step 1: Confirm the seal is broken — fog between panes that doesn’t wipe off.
Step 2: For minor cases apply window seal repair film on the outside.
Step 3: For severe cases the glass unit needs replacing — not the whole window.
Step 4: Contact a glass specialist for unit replacement — cheaper than full window.