How do I know if my window seals have failed?

Failed window seals are most commonly identified by condensation or fogging between the glass panes - this is the clearest sign that the insulating gas has escaped and moisture has entered the sealed unit.

Visual signs of seal failure include persistent fog, water droplets, or a milky haze between the glass panes that you can't wipe away from either side. You might also notice mineral deposits or water stains on the interior surfaces of the glass. In winter, you may see frost or ice crystals forming between the panes, and in summer, the condensation becomes more apparent during temperature changes.

Performance indicators that suggest seal failure include increased energy bills, drafts around the window even when it's closed, and difficulty maintaining consistent indoor temperatures. Failed seals mean your window has lost its insulating properties - the argon or krypton gas that provides thermal efficiency has escaped and been replaced by regular air and moisture.

In Ottawa's climate, seal failure becomes more noticeable during our temperature extremes. The freeze-thaw cycles put additional stress on window seals, and the significant temperature differences between indoors and outdoors make condensation more visible. Double-pane windows typically show seal failure more obviously than triple-pane units, which may continue to provide some insulation even with one failed seal.

Age and quality factors play a role - most quality windows have seals that last 15-20 years, though cheaper units may fail sooner. South-facing windows often experience seal failure first due to UV exposure and thermal cycling. Once seals fail, the window unit needs replacement rather than repair, as re-sealing is typically not cost-effective.

If you're seeing these signs in multiple windows, it may be time to consider a full window replacement project. For a professional assessment of your window seals and energy efficiency, request a quote from Ottawa Window Pros.

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