1. Stop at the safety boundary
Do not replace windows based on one condensation event without checking indoor moisture and ventilation.
2. Capture the baseline
Take one context photo, one close view and a short note describing location, date, weather, recent water use, equipment state and occupancy.
3. Track the trigger
Cold outdoor weather, high indoor humidity and closed coverings.
4. Compare, do not assume
Supports this pathway
- Condensation is broad across the glass
- It worsens overnight
- Opening coverings or reducing humidity changes it
Weakens this pathway
- Water begins at an exterior joint during rain
- Fog is between panes
- Only one frame corner wets with no glass condensation
5. Repeat only safe checks
- Record indoor humidity and outdoor temperature
- Compare with blinds open and closed
- Check airflow at the window without using open flames
6. Decide the next step
If the pattern is active, expanding, safety-related or requires opening inaccessible construction, stop self-help testing and prepare an evidence-based handoff. An HVAC or window professional can help when condensation is persistent or damaging finishes.
7. Verify the outcome
After any action, repeat the same observation under a comparable trigger. A dry surface immediately after work is not sufficient proof when the original symptom was intermittent.
Observe→Compare triggers→Repair source→Verify outcome
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