How to Tell If Your Window Seals Are Failing
Most people do not spot a bad window seal the day it fails. They catch the symptoms later, after the glass starts fogging, the room feels less comfortable, or the window no longer behaves like a sealed unit should. The clearest red flag is moisture sitting inside the insulated glass unit. Surface condensation is common and usually tied to indoor humidity, but fog between the panes points to a broken seal. Cleaning the outside will not fix it, because the problem is insid