Question 1

Why do my windows fog up only on the coldest mornings?

Accepted Answer

Window fogging on cold mornings happens because of the temperature difference between your warm, humid indoor air and the cold window surface. When warm air hits the cold glass, the moisture in that air condenses into water droplets - just like how your breath fogs up a car window in winter.

Condensation forms when the window surface temperature drops below the dew point of your indoor air. On the coldest Ottawa mornings, single-pane windows or older double-pane windows with poor insulation get

Question 2

Is condensation on the inside of windows a problem?

Accepted Answer

Yes, condensation on the inside of windows is definitely a problem that indicates excess humidity and poor ventilation in your home. While occasional light condensation during extreme temperature differences is normal, persistent interior condensation can lead to mold growth, wood rot, and structural damage.

Interior window condensation occurs when warm, humid indoor air meets the cold glass surface, causing water vapor to condense into droplets. This is most common during Ottawa's cold winter

Question 3

Can failed argon gas seals be refilled?

Accepted Answer

No, failed argon gas seals cannot be refilled - once the seal fails and the gas escapes, the entire insulated glass unit (IGU) needs to be replaced.

When argon gas seals fail, you'll typically notice fogging or condensation between the glass panes that can't be cleaned from either side. This happens because the hermetic seal that keeps the argon gas trapped between the panes has been compromised, allowing moisture and air to enter the space. The argon gas, being heavier than air, gradually esca

Question 4

What causes drafts around windows even when they're closed?

Accepted Answer

Drafts around closed windows are typically caused by worn weatherstripping, poor installation, or settling that creates gaps between the window frame and the rough opening. The most common culprit is deteriorated weatherstripping around the sash, but air can also leak through gaps in the frame itself or around the perimeter where the window meets the wall.

Weatherstripping Problems
Over time, the rubber or foam weatherstripping around your window sash compresses, cracks, or pulls away from the

Question 5

What is causing the black mold around my windows?

Accepted Answer

Black mold around windows is typically caused by excess moisture and poor ventilation, creating the perfect environment for mold growth in these naturally cooler areas of your home.

The primary culprit is condensation. When warm, humid indoor air meets the cooler surface of your window glass or frame, water droplets form. This moisture, combined with dust and organic matter, provides everything mold needs to thrive. In Ottawa's climate, this problem is especially common during winter months whe

Question 6

My windows are foggy - can they be fixed or do I need new ones?

Accepted Answer

Foggy windows can sometimes be repaired, but replacement is often the most cost-effective long-term solution. The answer depends on where the fogging is occurring and the age of your windows.

Interior fogging that wipes away easily is usually just condensation from indoor humidity and can be managed with better ventilation, exhaust fans, or a dehumidifier. However, fogging between glass panes indicates seal failure in double or triple-pane windows, which is a more serious issue.

When the seal

Question 7

Why is there condensation between my window panes?

Accepted Answer

Condensation between window panes indicates a broken seal in your insulated glass unit (IGU), which means the window has lost its energy efficiency and needs replacement.

When you see fog, moisture, or water droplets between the glass panes of a double or triple-pane window, the hermetic seal around the perimeter has failed. This seal is designed to keep the space between panes completely airtight and moisture-free. Once it breaks, outside air and humidity enter the space between the glass, cau

Question 8

My window won't stay open - can this be fixed?

Accepted Answer

Yes, most window opening issues can be fixed, and many are simple repairs that don't require full window replacement. The solution depends on what type of window you have and what's causing the problem.

For double-hung windows (the most common type), the issue is usually broken sash cords, worn balance springs, or damaged window balances. In older homes with rope and pulley systems, the cords can snap over time. Newer windows use spring-loaded or spiral balances that can wear out after 15-20 ye

Question 9

Why do my windows whistle when it's windy?

Accepted Answer

Whistling windows are typically caused by air leaking through gaps in the window frame, weatherstripping, or sash, creating a sound as wind passes through these small openings at high speed.

The most common culprits are worn or damaged weatherstripping around the window sash, gaps between the window frame and the wall, or warped window components that no longer seal properly. Even small gaps of just a few millimeters can create that distinctive whistling sound when Ottawa's strong winds hit you

Question 10

Why is there frost on the inside of my windows?

Accepted Answer

Interior window frost forms when warm, humid indoor air meets a cold window surface, causing water vapor to freeze directly onto the glass. This typically happens when your windows aren't providing adequate insulation against Ottawa's harsh winter temperatures.

The main culprit is usually single-pane windows or older double-pane windows that have lost their insulating properties. When outdoor temperatures drop below -10°C (common in Ottawa winters), even double-pane windows with poor seals can

Condensation & Drafts