Condensation between panes in University City, San Diego
Condensation or fog that forms between the two panes of glass, not on the interior or exterior surface, is a sign the insulated glass unit's seal has failed. This is different from ordinary condensation on the room-side surface of a window, which is a humidity issue, not a broken seal.
Newer builds, Low-E upgrades and HOA design review.The marine layer keeps summers mild, but these newer planned communities sit far enough inland to warm up on August afternoons, so heat gain through west-facing glass still matters. Most homes here were built with their original windows, so the stock is younger and the failures are early seal fatigue and worn hardware rather than decades-old aluminum.
The 1960s-70s homes in south UC around Governor Drive still carry a fair amount of original single-pane aluminum reaching the end of its service life, while the newer north-of-52 homes mostly need retrofit upgrades to Low-E glass rather than a full redo. The UTC high-rises near Westfield and the research district run large fixed and sliding units serviced through building management, and the coast-adjacent air still works on exposed hardware.
What causes it
- Failed IGU seal letting humid air into the sealed cavity between panes
- Loss of the argon or krypton gas fill through the same seal failure
- Age: most IGU seals reach the end of their service life somewhere between 10 and 20 years
How it gets fixed
- IGU glass replacement when the frame and sash are sound
- Full window replacement when the frame is also compromised
What it costs to fix in University City
Pricing is the same across San Diego County with no upcharge for University City. We confirm a written quote before any work starts.
Condensation between panes questions in University City
Why does this happen in University City?
Condensation or fog that forms between the two panes of glass, not on the interior or exterior surface, is a sign the insulated glass unit's seal has failed. This is different from ordinary condensation on the room-side surface of a window, which is a humidity issue, not a broken seal.. In University City, a split of full-frame dual-pane replacement on the older south tract homes, retrofit and hardware upgrades on the newer north stock, and specialty high-rise window service in the utc towers., which shapes how this shows up.
What is the difference between condensation on the glass and condensation between the panes?
Surface condensation (on the room-side glass) is a humidity and temperature issue that can be managed with ventilation or a warmer glass surface. Condensation between the panes means the sealed unit itself has failed and the glass needs to be replaced.
Can I dry out condensation between the panes?
No. The cavity is sealed and not accessible without replacing the glass unit. Any moisture inside will keep recurring because the seal that is supposed to keep it out has already failed.
Does condensation between panes mean I lost the argon fill too?
Almost always, yes. The same seal failure that lets humid air in also lets the insulating gas fill escape, so the window has lost both its clarity and part of its thermal performance.
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