Cloudy, foggy, or hazy windows are caused by a failed window seal — not dirty glass. We replace only the insulated glass unit (IGU), restoring crystal-clear views and energy efficiency without replacing your entire window.
Foggy, cloudy, or hazy windows are caused by failed window seals — not dirty glass. Modern double and triple pane windows contain an insulated glass unit (IGU) filled with argon gas between two or three panes of glass.
Over time, the seal around the IGU breaks down due to age, temperature cycling, and UV exposure. Once the seal fails, outside air and moisture infiltrates between the panes. This trapped moisture creates condensation — that foggy, wet appearance you see inside the glass.
The glass itself is typically undamaged. The frame is fine. Only the insulated glass unit needs to be replaced — and that's exactly what we do throughout Northern Virginia.
Foggy windows are caused by a failed window seal. Modern double and triple pane windows have an insulated glass unit (IGU) filled with argon or krypton gas between the panes. When the seal around the IGU breaks down — due to age, temperature cycling, or moisture — outside air and humidity gets inside the unit. This causes condensation, cloudiness, and that characteristic foggy appearance between the panes. The glass itself is usually fine; it's the seal that has failed.
The seal itself cannot be repaired — once it fails, the integrity of the insulated glass unit is compromised. However, you do NOT need to replace the entire window. In most cases, we can replace only the insulated glass unit (IGU) — the glass portion — while keeping your existing window frame. This saves homeowners hundreds or even thousands of dollars compared to full window replacement.
Most homeowners with foggy windows only need new glass, not a new window. If your window frame is in good condition — no rotting, warping, or broken hardware — we can simply replace the insulated glass unit inside the existing frame. This is faster, less disruptive, and significantly less expensive. We'll inspect your windows and give you an honest recommendation.
Replacing an insulated glass unit (IGU) in Northern Virginia typically costs $150–$400 per window depending on size, glass type, and accessibility. This is dramatically less expensive than full window replacement, which can run $500–$1,500+ per window installed. Most foggy window repair jobs can be completed in a single visit with same-day service available.
Condensation between window panes is caused by seal failure. When the hermetic seal around the insulated glass unit breaks, outside humid air enters the space between the glass panes. When temperatures change, that moisture condenses on the interior glass surfaces, creating the foggy, wet appearance. This is 100% a seal failure issue — it cannot be cleaned away because the moisture is inside the sealed unit.
Most IGU replacements take 1–2 hours per window once the new glass arrives. We measure your windows during an initial visit, order custom-cut insulated glass units, and return to install them — typically within 3–7 business days. For common standard sizes, we may have glass in stock for same-day service.
Yes — significantly. Replacing just the insulated glass unit can cost 60–80% less than full window replacement. A typical IGU replacement runs $150–$400, while a full window replacement (frame, glass, installation) often costs $500–$1,500 per window. As long as your frames are structurally sound, glass-only replacement is almost always the smarter choice.
Absolutely. When we replace your foggy IGU, we install new double or triple pane glass filled with argon gas and optionally upgraded to Low-E glass coating. Low-E glass reflects heat and UV rays, reducing your heating and cooling costs. Many homeowners notice measurable improvement in their energy bills after replacing failed foggy windows with new insulated glass units.
We serve homeowners throughout Northern Virginia. Select your city for local foggy window repair information.
Most foggy windows do NOT need full replacement. Call now for a free estimate.