How do I stop cold air from coming in around my windows?

Cold air infiltration around windows is typically caused by worn weatherstripping, gaps in the window frame, or poor installation. The most effective solutions range from simple DIY fixes to professional window replacement, depending on the severity of the problem.

Start by identifying where the cold air is entering. On a windy day, hold a lit candle or incense stick around the window perimeter - the flame will flicker where air is leaking in. Common problem areas include the bottom sash, where the window meets the frame, and around the window trim.

For immediate DIY solutions, check your weatherstripping first. Window weatherstripping should compress when the window closes but spring back when opened. If it's cracked, compressed flat, or missing entirely, replace it with new foam, rubber, or brush-style weatherstripping from any hardware store. You can also apply removable window film or use rope caulk as temporary winter solutions.

Caulking gaps between the window frame and wall is another effective fix. Remove old, cracked caulk and apply new exterior-grade caulk around the outside perimeter. Inside, use paintable acrylic caulk between the trim and wall. However, avoid caulking the weep holes at the bottom of the exterior frame - these allow moisture to drain out.

In Ottawa's harsh winters, older windows often have fundamental issues that weatherstripping can't solve. Single-pane windows, loose-fitting sashes, or windows with broken seals in double-pane glass will continue losing energy despite your best efforts. If you're spending significant money on heating bills and constantly fighting drafts, replacement with modern triple-pane windows typically pays for itself through energy savings.

Modern replacement windows feature multiple weatherstripping systems, insulated frames, and proper installation techniques that eliminate air infiltration. In Ottawa's Climate Zone 6, triple-pane windows with Low-E coatings can reduce heat loss by 40-50% compared to older windows.

For persistent air leakage issues or if multiple windows need attention, consider having a professional assessment. Licensed installers can identify whether the problem is fixable with maintenance or if window replacement would be more cost-effective long-term.

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