Why does my Quispamsis house get so much condensation on the inside of windows every winter even with new windows installed?

Condensation on new windows is actually a sign they're working properly — your old windows were likely leaking so much air that moisture escaped before it could condense. The real issue is excess humidity inside your home, not the windows themselves.

Understanding the Physics
When warm, humid indoor air hits the cold glass surface, it reaches its dew point and condenses into water droplets. Even high-performance windows with Low-E coatings and argon gas fills will show condensation if your indoor humidity is too high. In Quispamsis's winter climate, with outdoor temperatures regularly hitting -15°C to -25°C, that glass surface becomes very cold despite insulated frames.

Common Humidity Sources in New Brunswick Homes
Your home likely has multiple moisture sources working against you. Cooking, showering, laundry, houseplants, and even breathing add significant moisture to indoor air. Many Quispamsis homes from the 1970s-1990s were built with minimal ventilation, and if you've added insulation or air sealing without addressing ventilation, you've created a moisture trap. Basement moisture is particularly common in the Kennebecasis River valley due to high water tables and clay soils.

Immediate Solutions
Install and actually use bathroom exhaust fans during and after showers — run them for at least 30 minutes post-shower. Use your kitchen range hood when cooking, especially when boiling water or using the dishwasher. Consider a whole-home dehumidifier if you have forced-air heating, or portable dehumidifiers in problem areas. Crack a window slightly in bedrooms overnight if condensation is severe — even in winter, this controlled ventilation helps.

Long-term Ventilation Upgrades
A heat recovery ventilator (HRV) is the gold standard solution for New Brunswick homes. HRVs bring in fresh outdoor air while capturing heat from the stale exhaust air, maintaining comfortable temperatures while controlling humidity. Installation typically runs $2,500-$4,500 depending on your home's layout and existing ductwork. NB Power offers rebates through their Total Home Energy Savings Program for qualifying HRV installations.

When to Call a Professional
If condensation persists despite controlling humidity sources, you may need a building envelope assessment. Excessive moisture could indicate air leakage, missing vapor barriers, or basement moisture issues that require professional diagnosis. Contact the Town of Quispamsis Development Services if you're planning major ventilation upgrades that might require permits.

Next Step: Start by monitoring your indoor humidity with a simple hygrometer ($15-$30) — ideal winter levels are 30-40% relative humidity. If you're consistently above 50%, focus on source control and ventilation improvements.