If you can’t wipe the moisture away from either the inside or outside, it is inside the unit.
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A broken window seal is an inevitable degradation event in the lifecycle of an Insulated Glass Unit, driven primarily by the laws of thermodynamics and material fatigue. While the aesthetic nuisance of fogging can be temporarily addressed through defogging ventilation
Defogging is often marketed as a “miracle cure” because it’s cheaper and faster than full replacement. The process involves drilling tiny holes in the exterior pane, injecting cleaning solutions and drying agents to clear the condensation, and then sealing the holes with small micro-vents to allow future moisture to escape. Defogging typically costs $70–$250.
— Check your windows twice a year for cracks, gaps, or areas where the seal has pulled away from the frame. Look for early signs of fogging, distortion, or moisture between the panes.
A visual inspection is often confirmed by tactile and thermal data. A broken seal renders the window effectively a single-pane unit. Homeowners may notice: