Foggy Windows Between Glass Panes? Complete Condensation Repair Guide
Don't let foggy windows ruin your home's appearance and energy efficiency. Learn the causes, DIY solutions, and when to call professionals for window condensation issues in Toronto.
Quick Action Required?
If you're dealing with extensive fogging or multiple failed windows, get a professional assessment.
Call (416) 555-1234 - Free QuoteWhat You'll Learn
Understanding Window Condensation Issues
Quick Diagnosis
Condensation ON the glass? Usually a humidity/ventilation issue.
Condensation BETWEEN glass panes? Seal failure - requires repair or replacement.
Window condensation between glass panes (also called "fogging" or "failed seals") affects over 60% of double-pane windows over 15 years old in Toronto's climate. The issue occurs when the seal between glass panes deteriorates, allowing moisture to enter the insulated space.
Why This Happens in Toronto
Temperature Extremes
-20°C to +35°C swings stress window seals
High Humidity
Lake Ontario moisture increases seal pressure
UV Exposure
Sun degrades sealant compounds over time
4 Main Causes of Window Condensation
Seal Failure
High ImpactMost common cause - the seal between glass panes has deteriorated, allowing moisture to enter
$300-800 to replace
Temperature Fluctuations
Medium ImpactExtreme temperature changes cause expansion/contraction, weakening seals over time
Preventable with maintenance
High Humidity
Low ImpactExcess moisture in the air increases pressure on window seals
$50-200 dehumidifier
Poor Installation
High ImpactWindows not properly installed allow air and moisture infiltration
$500-1500 reinstallation
DIY Repair Methods (Try These First)
Important Disclaimer
DIY methods provide temporary relief at best. For windows under warranty or expensive custom units, consult professionals first to avoid voiding coverage.
Assess the Damage
Determine if condensation is between panes or just on surfaces
Step-by-Step Instructions:
- 1Clean both sides of the window thoroughly with glass cleaner
- 2Check if fog/condensation remains after cleaning
- 3If condensation persists between glass panes, seal is likely failed
- 4Take photos to document the extent of fogging
Try the Hair Dryer Method
For minor fogging, heat can sometimes clear moisture temporarily
Step-by-Step Instructions:
- 1Set hair dryer to warm (not hot) setting
- 2Hold 6-8 inches away from window
- 3Heat the foggy areas for 2-3 minutes
- 4Note: This is only temporary - seal still needs repair
Drill and Drain Method
Advanced DIY option - drill small holes to release moisture
Step-by-Step Instructions:
- 1⚠️ Warning: This can damage your window permanently
- 2Drill small hole at bottom corner of affected pane
- 3Allow moisture to drain out over 24-48 hours
- 4Seal hole with clear silicone when dry
- 5Success rate: 30-50%, may need professional replacement
Professional Repair Options
Professional repairs offer higher success rates and warranties. Here's what Toronto window specialists typically recommend:
Seal Replacement
Replace failed seals while keeping existing glass
Glass Unit Replacement
Replace the entire insulated glass unit (IGU)
Full Window Replacement
Replace entire window frame and glass
Why Choose Professional Repair?
- • Proper diagnosis prevents recurring issues
- • Warranties protect your investment
- • Professional tools ensure lasting repairs
- • Often covered by home insurance (with receipt)
Preventing Future Condensation Issues
The best repair is prevention. These strategies can extend your windows' life by 5-10 years:
When to Call Professionals Immediately
Don't wait if you notice:
Get Professional Help Today
Free assessment • Same-day service available • 10-year warranty on replacements