Water on the inside of windows usually means indoor humidity is high.
Reduce it
- Run kitchen and bathroom exhaust fans
- Open curtains during the day to let glass warm
- Keep indoor humidity moderate; a hygrometer helps
- Dry laundry outside or vent the dryer
- Wipe up water to prevent mold and damage to sills
Between panes?
Fog between double-pane glass usually means the seal has failed. A window pro can advise on repair or replacement.
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