Why does glass fog up between the panes?

The seal around the insulated glass unit has failed, letting moisture in between the two panes. It's a manufacturing or age-related seal failure, not a cleaning problem.

Can you fix a foggy window without replacing the whole window?

Yes, in most cases only the glass unit needs to be replaced while the existing frame and sash stay in place.

How long does glass unit replacement take?

A single window's glass can often be replaced in under an hour once the correct-size unit is on hand, though ordering the glass may take a few days.

If one window is fogging, will the others fail too?

Not necessarily, but if all the windows were installed at the same time, it's common for others to start failing within a similar timeframe.

Foggy window glass replacement

A window that looks cloudy or has moisture trapped between the panes has a failed seal on the insulated glass unit. It's not a sign the whole window needs replacing. In most cases the sash and frame are still fine and only the glass itself needs to be swapped out.

This is common in Connecticut homes with vinyl or wood windows that are ten to twenty years old, especially if several windows were installed around the same time and are starting to fail together. A window repair company can measure the existing opening, order a matching insulated glass unit, and reinstall it without disturbing the frame, trim, or siding.

Cloudy or hazy glass that won't clear with cleaning
Visible moisture or streaking between the panes
Reduced insulation and higher energy bills from a failed seal
Glass-only replacement that keeps the existing frame intact

If several windows in the house are the same age, it's worth asking for a whole-house glass inspection rather than fixing them one at a time as each one fails.

What it costs

Pricing depends on the size of the glass unit, whether it has a low-E coating or argon fill to match the rest of the house, and how many windows need new glass. Replacing just the insulated glass unit is generally less expensive than replacing the entire window, as long as the frame and sash are still sound.

Top 3 by our score

Ranked from our published scoring of public Google reviews for window repair.

1. Best Glass LLC
5.0★ · 183 reviews

93
2. Prestige Window and Door Repair Connecticut
4.9★ · 152 reviews

89
3. Your Glazier Experts
5.0★ · 134 reviews

92

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FAQ

Why does glass fog up between the panes?: The seal around the insulated glass unit has failed, letting moisture in between the two panes. It's a manufacturing or age-related seal failure, not a cleaning problem.
Can you fix a foggy window without replacing the whole window?: Yes, in most cases only the glass unit needs to be replaced while the existing frame and sash stay in place.
How long does glass unit replacement take?: A single window's glass can often be replaced in under an hour once the correct-size unit is on hand, though ordering the glass may take a few days.
If one window is fogging, will the others fail too?: Not necessarily, but if all the windows were installed at the same time, it's common for others to start failing within a similar timeframe.

Enquiries submitted through our contact and quote forms may be passed to partner providers who perform the work, and we may receive a referral fee. Our rankings and scores are determined solely by our published methodology and are not affected by referral fees.