Window seal failure
Sooner Exterior Home Services
Fog between the panes means the insulating seal has failed. The window still works – the loss is cosmetic plus a modest efficiency drop.
Glass-only replacement is sometimes possible and much cheaper than the full unit. Many insulating units carry long glass warranties that survive a change of ownership – look for the spacer stamp between the panes before paying. Condensation on the inside surface in winter is indoor humidity, not seal failure.
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Written by Jaylan Jones. Sooner Exterior Home Services earns a referral fee when a call connects to a contractor. See our business-model disclosure.