What Causes Double Pane Windows to Fog?

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Condensation Between Window Panes


What Causes Double Pane Windows to Fog?

Double pane windows become foggy when the seal is broken and moisture is allowed into the sealed unit. Double pane windows have a layer of gas (usually Argon) in between the two panes that acts as insulation. If the seal is broken moisture will accumulate and you will experience condensation, or fog, in between your two panes of glass.

Learn more about sealed double pane windows.

Can Condensation Inside Double Pane Windows Be Fixed?

Although there are temporary ways to repair your foggy double pane windows the only long-term solution is to replace the sealed unit itself. Luckily this does not require getting completely new windows. You can just replace the panes of glass. This lets you remove the fog on your glass and help your home shine!

Temporary Fixes

Many companies offer a temporary fix for foggy windows. The temporary fix offered by some companies consists of drilling a small hole into the glass and sucking out the moisture from between the two panes of glass. This will remove the fog, but since the window is no longer sealed eventually the fog will re-accumulate. Apex Glass does not offer this service because we feel that long term it doesn’t work. We would rather do it right the first time.

Sealed Glass Unit Replacement

The best way to fix a foggy window is to have the entire unit replaced. In most cases we do not even need to replace the window frame and just the window panes themselves. The new window panes are completely sealed and offer superior insulation compared to broken double pane or single pane units.

For more information on double pane window replacement see our Sealed Units Replacement page.