Foggy windows: repair the glass or replace the whole window?
If moisture sits between the two panes and you cannot wipe it off, the insulated glass unit has lost its seal. In most Milwaukee homes you do not need a new window — only new glass.
Why Wisconsin windows fog up
- A double-pane window is a sealed unit with argon gas and a desiccant strip between the panes.
- Milwaukee's freeze-thaw swings expand and contract that seal every season until it fails.
- Once it fails, humid air enters, the desiccant saturates, and you see fog, haze or mineral streaking.
- The insulating value drops significantly, so heating bills climb through the winter.
When glass-only replacement is the right call
- The frame, sash and hardware are solid and operate smoothly.
- The window is less than roughly 20-25 years old.
- Only one or two units in the house are fogged.
- Glass-only replacement typically costs 50-70% less than a full window replacement and is done in a single visit.
When to replace the entire window
- Rotted wood, cracked vinyl or a sash that no longer closes square.
- Drafts and water infiltration around the frame, not just fog inside the glass.
- You are changing the window style or size during a remodel.
Frequently asked
- Can fog between panes be cleaned out?
- No. Drilling and 'defogging' services do not restore the gas fill or the seal. Replacing the insulated glass unit is the lasting fix.
- How long does glass-only replacement take?
- We measure, order the custom unit (about 1-2 weeks), then swap it in — usually under an hour per window.
- Do you match Low-E and argon on the new unit?
- Yes. We spec Low-E coating and argon fill so the new unit performs like the original did when new.
Need this done in Milwaukee?
AJ Glass LLC measures, fabricates and installs. Free on-site estimates.