How do I fix the condensation on my windows in the winter?

Condensation on windows during Vancouver's wet winters is extremely common and usually indicates excess indoor humidity combined with poor air circulation. The good news is that most cases can be resolved with a combination of humidity control and improved ventilation.

Understanding the Problem
Condensation forms when warm, humid indoor air meets the cold glass surface of your windows. In Metro Vancouver's mild but very wet climate, this is especially problematic because we tend to keep our homes sealed tight against the rain while cooking, showering, and breathing indoors. The issue is most severe on single-pane windows or older double-pane units with poor seals, which are common in Vancouver's older housing stock including character homes and Vancouver Specials built before modern energy codes.

Immediate Solutions
Start by reducing indoor humidity levels to 30-40% during winter months. Use exhaust fans in bathrooms and kitchens religiously – run your bathroom fan for at least 30 minutes after showering and your range hood while cooking and for 15 minutes afterward. If you don't have exhaust fans or they're inadequate, this is a worthwhile upgrade that typically costs $300-800 per fan installed. Open windows briefly each day for fresh air exchange, even during rainy weather – just 5-10 minutes can help significantly.

Improve Air Circulation
Ensure your heating system's air filter is clean and that vents aren't blocked by furniture or curtains. If you have radiators or baseboard heating (common in older Vancouver homes), consider adding a small fan to circulate air near problem windows. For homes with forced-air heating, upgrading to a programmable thermostat with a fan setting can help maintain consistent air movement.

Window and Insulation Upgrades
If condensation persists despite humidity control, your windows may need attention. Storm windows can be an effective interim solution for character homes where window replacement isn't desired, costing $200-500 per window. For severe cases, window replacement with modern double or triple-pane units may be necessary – expect $400-1,200 per window depending on size and quality. Under BC's CleanBC Better Homes program, income-qualified homeowners can receive rebates up to $5,000 for window upgrades (call 1-844-881-9790 or visit betterhomesbc.ca).

When to Call a Professional
If condensation appears between glass panes in double-pane windows, the seal has failed and the window needs replacement – this isn't a DIY fix. Similarly, if you notice mold growth around windows or persistent condensation despite following these steps, you may have ventilation issues that require an HVAC contractor's assessment. Excessive condensation can also indicate inadequate insulation, which may require a building envelope specialist to evaluate.

Start with the humidity control measures immediately – they're free and often solve 80% of condensation problems.

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