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October 9, 2025
Why Condensation on Windows Leads to Mold in Newberg Homes
Your Newberg windows are covered in condensation every morning, and you've started noticing mold on the sills and surrounding drywall. Window condensation is not just a cosmetic problem. It's a sign that indoor humidity is too high, and that moisture is feeding mold growth.
Harris Restoration
Why Windows Develop CondensationCondensation forms when warm, humid indoor air contacts a cold surface
In Newberg, winter mornings bring exterior temperatures into the 30s and 40s, which cools window glass.
When warm air inside your home touches that cold glass, moisture condenses and drips onto the sill
This happens most often in bathrooms, kitchens, and bedrooms, where humidity is naturally higher. Older single-pane windows and poorly sealed frames make the problem worse because they allow more heat transfer.How Window Condensation Causes MoldWater that condenses on windows does not evaporate quickly in winter because indoor humidity stays high. The moisture soaks into wood sills, drywall, and any porous material near the window.
Once those materials stay damp for more than 48 hours, mold colonizes them. You'll notice black spots on sills, staining on drywall below windows, or peeling paint. Mold releases spores into the air, which can cause respiratory symptoms and allergic reactions.How to Reduce Indoor HumidityRun exhaust fans in bathrooms during and after showers.
Use range hoods when cooking. Vent clothes dryers outside, not into the home. Run a dehumidifier in winter to keep indoor humidity below 50 percent.
Open windows briefly on warmer days to exchange humid indoor air with drier outdoor air. Check that your HVAC system is properly sized and functioning. Oversized systems cycle too quickly and do not remove enough humidity.Professional Mold Remediation and Humidity ControlWe inspect windows, measure indoor humidity, and locate mold growth on sills, frames, and surrounding drywall.
Then we remove contaminated materials, treat surfaces with antimicrobials, and dry everything thoroughly. We also assess your ventilation system and recommend upgrades if needed. If humidity issues are severe, we can install a whole-home dehumidifier that integrates with your HVAC system and maintains optimal levels year-round.Insurance and Condensation MoldMold from condensation is usually excluded as a maintenance issue.
However, if condensation resulted from a sudden event like HVAC failure or a roof leak that allowed humid air to accumulate, there may be coverage. We document the timeline, photograph all findings, and provide a detailed scope. If any part of the loss is covered, we handle the claim.If condensation is causing mold around your windows, call for a free inspection.
We'll remove the mold, fix the moisture source, and restore your home to safe, healthy condition..
DON'T WAIT.
The Damage Won’t.
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How HVAC Condensate Leaks Cause Mold in Portland Homes
Your Portland air handler is leaking water, and you've noticed mold growing on the ceiling or walls near the unit. HVAC condensate leaks are a common cause of hidden mold because they drip slowly and go unnoticed for weeks while moisture soaks into drywall and insulation.
Tom White
Art Director
What to Do When Your Refrigerator Leaks in Salem
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Tom White
Art Director
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Tom White
Art Director