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Fogging between panes or visible seal failure: once the sealed insulating unit between panes fails, moisture enters the air gap and condenses against the glass. No amount of cleaning fixes it — the unit itself has failed. In Clark County's damp fall and winter months, seal failures show up quickly: a haze that's always there regardless of indoor humidity. This is the most common indicator that replacement, not repair, is the right call.
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Condensation forming on the interior glass surface: surface condensation on the room-facing side of the glass is a thermal performance signal. When the window's center-of-glass U-factor is too high, the interior surface drops below the dew point during cold nights. Vancouver homeowners in older single-pane or early double-pane homes notice this most during November through February when heating runs continuously and outdoor temperatures drop.
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Drafts at the frame, sill, or corners: air infiltration around window frames accounts for a significant share of heating load in Clark County homes. Weatherstripping degrades, frame materials shrink and gap with age, and caulking at the exterior perimeter fails after 10–15 years. If you can feel air movement near the window on a windy or cold day, the window is no longer performing as a thermal barrier — it's functioning as a vent.
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Single-pane aluminum frames from the 1970s and 1980s: a substantial portion of Vancouver's residential housing stock was built during the era when aluminum single-pane windows were standard. These frames have no thermal break and the glazing has no insulating air gap. They transfer cold directly from outdoors to the interior surface, produce condensation constantly in winter, and contribute meaningfully to heating bills. Replacement with a properly sealed, Energy Star rated double-pane unit represents a significant and measurable change in performance.
What Window Replacement Delivers for Vancouver Homeowners
Vancouver's heating season runs October through March — six months during which a poorly sealed home continuously loses conditioned air through gaps, failed seals, and under-performing glass. A properly installed ProVia replacement window closes those pathways. Low-E glass coatings limit radiant heat loss, insulated frames eliminate the conduction path that aluminum frames provided, and precision fitting eliminates the gap infiltration that weathered caulking can't fully address. The performance difference in a Clark County home is measurable on the heating bill and immediately noticeable at the window surface on cold nights.
As a ProVia authorized dealer, Left Coast Exteriors installs the full ProVia window lineup with access to factory training, installer certification, and warranty support that direct-to-consumer window channels don't provide. Every installation includes proper shimming, air sealing at the rough opening, exterior flashing where needed, and interior trim restoration. A window installed correctly into a properly prepared opening performs at its rated values. A window dropped into an unprepared opening doesn't, regardless of the product quality.
ProVia Authorized Dealer