If the glass in your window has turned cloudy, hazy, or streaked and cleaning doesn’t seem to help, the seal inside the insulated glass unit may have failed. What looks like fog on the glass is actually moisture trapped between the panes. This is a common issue with double-pane windows, but it doesn’t necessarily mean you need a whole new window. Delux Windows & Glass can measure your existing frame and fabricate a custom-fit replacement glass unit, restoring clear glass and proper insulation in as little as one to two days.
Quick Answer
Foggy glass between panes means a broken seal, not necessarily a broken window. In most cases, Delux replaces just the glass unit inside your existing frame, matched to your exact window dimensions, so you get clear glass and full insulation back without a full window replacement.
Key takeaways:
- Cloudy or foggy glass between panes signals a failed seal, not dirty glass
- Seals typically last 10 to 20 years before wear sets in, and Las Vegas heat shortens that window
- Delux replaces the glass unit inside your current frame in most cases, often in one to two days
- Every replacement is custom-measured and fabricated to fit your specific window opening
- A free in-home assessment tells you whether you need a repair or a full replacement
Why Your Window Looks Foggy or Cloudy Between the Panes
Most homes in Las Vegas have double-pane windows, technically called insulated glass units (IGUs). Two panes of glass sit with a small gap between them, sealed shut at the edges, with a strip of desiccant material tucked inside the spacer bar to soak up any stray moisture. That sealed gap is what gives the window its insulating power. When the seal is intact, it keeps humidity and external air out of that space entirely.
Over years of sun exposure and temperature swings, the sealant holding the two panes together dries out and cracks. Once that happens, outside air and moisture start working their way in. The desiccant inside can only absorb so much before it’s saturated, and once it’s full, condensation forms between the panes, where you can’t wipe it away. That’s the fog you’re seeing. It’s not a cleaning problem. It’s a sign the seal is gone.
Why the Las Vegas Heat Makes This Happen Faster
Window seals are rated to last somewhere between 10 and 20 years under normal conditions. Homes in the Las Vegas Valley don’t get normal conditions. South- and west-facing windows here spend months absorbing direct desert sun, and that heat causes the glass and spacer materials to expand and contract more aggressively than they would in a milder climate. That repeated stress is what wears a seal down early, sometimes well before the 10-year mark, especially on older or lower-grade installations.
This isn’t just a cosmetic issue. The U.S. Department of Energy estimates that inefficient windows can account for a significant share of a home’s wasted heating and cooling energy, since a broken seal stops them from blocking heat transfer as they’re designed to. In a city where air conditioning runs most of the year, a failed seal shows up on your utility bill as much as it shows up on the glass.
Repair the Glass, or Replace the Whole Window?
Here’s the part homeowners are usually relieved to hear: a failed seal doesn’t mean the frame is bad. If your window still opens, closes, and locks properly, and the frame itself isn’t warped, rotted, or damaged, the fix is almost always a glass-only replacement. The existing frame stays in place, and only the insulated glass unit inside it is replaced.
Full window replacement makes sense when the frame itself has failed: due to wood rot, warped vinyl, broken hardware, or a frame that no longer seals tightly against the house. During your in-home assessment, a Delux technician checks both the glass and the frame so you’re not paying for more than the window actually needs.
How Delux Measures and Fabricates Your Replacement Glass
Every window opening in a home is a little different, even within the same house, so precise measurement matters more than most homeowners expect. A Delux technician measures the exact opening, glass thickness, and spacer width required for your specific frame before ordering anything. That measurement goes to fabrication, where a new insulated glass unit is custom-built to match, rather than pulled off a shelf in a standard size.
Once the custom unit is ready, installation typically takes place in one to two days from the initial visit, with the technician fitting the new glass into your existing frame and sealing it to spec. The result is a window that looks and performs like new, without the cost or disruption of a full frame replacement.
FAQs
Why does my double-pane window look foggy on the inside?
Fog trapped between the panes indicates that the seal holding the insulated glass unit together has failed, allowing moisture to enter. It’s not dirt or condensation on the surface. Once the seal fails, moisture becomes trapped inside the glass and can’t be wiped away, which means the glass unit needs to be replaced.
Can you fix a foggy window without replacing the whole thing?
In most cases, yes. If your frame is still in good condition, Delux replaces just the insulated glass unit inside your existing frame rather than tearing out the whole window. The frame stays, the glass gets swapped for a custom-fabricated replacement built to match your exact opening.
How long does window glass replacement take?
Once your window is measured and the custom glass unit is fabricated, installation is typically completed in one to two days. Delux measures your specific opening first, since insulated glass units are custom-built rather than sold in standard sizes.
Why do window seals fail faster in Las Vegas than in other cities?
Seals are rated for 10 to 20 years, but intense desert sun accelerates the expansion and contraction that wears them down. South- and west-facing windows in the Las Vegas valley take on more direct heat than windows in milder climates, which shortens the seal’s usable life.
Is a foggy window just a cosmetic problem?
No. A broken seal stops blocking heat transfer, which means your home has to work harder to stay cool in the summer, and that shows up on your energy bill. Fixing the seal restores both the clear view and the insulation that the window was originally built to provide.
Do you offer window repair for homes outside Las Vegas proper?
Yes. Delux serves homeowners throughout the valley, including Henderson, Green Valley, Summerlin, and North Las Vegas, with the same measurement, fabrication, and installation process used for every job.
Delux Windows & Glass has served homeowners across the Las Vegas valley, including Henderson, Green Valley, Summerlin, and North Las Vegas, with decades of combined experience among the team measuring, fabricating, and installing glass built specifically for Nevada’s climate. Every assessment is free and done in your home, not over the phone.
Ready for Clear Glass Again?
A foggy window won’t clear up on its own, and waiting only increases your cooling costs. Schedule a free in-home window assessment with Delux Windows & Glass and find out whether your window needs a simple glass replacement or something more, with a straightforward answer and a fast turnaround either way.