Airing your home in winter and the window filter

Windows are opened less in winter, but the need for fresh air does not go away; in fact humidity and stale air build up faster indoors. In these months, when chimney smoke increases, brief and correct airing matters even more.

Published: 3 December 2024 · 2 min read

Window with a window filter fitted in winter

Why should we air our homes in winter?

Behind closed windows, cooking, showers, laundry and breathing add humidity to the air all day. In a home that is not aired, this humidity condenses on cold walls and around the glass; over time mould can form. The air gets heavy and smells build up.

Why is outdoor air dirtier in winter?

In cold weather, chimney smoke from heating increases. On still, cold days polluted air can be trapped close to the ground. That is why a black, greasy layer of soot appears more often on windowsills in winter.

Airing correctly: brief and with a cross-draught

Air briefly with the window fully open. Instead of leaving the window ajar for hours, opening opposite windows for a short time refreshes the air without chilling the walls.
Rather than the evening hours when chimneys are busiest, choose the middle of the day.
In the bathroom and kitchen, remove humidity at its source.

What does a window filter do in winter?

During brief airing, a window filter holds back some of the soot and grime particles from outside and most of the wind-blown dust. Windowsills and net curtains darken less.

Filter care in winter

You do not need to take the filter off. It withstands outdoor conditions.
Clean it once in midwinter. Soot from chimneys darkens the filter faster.
On the hook-and-loop model, check that the tape has not loosened in the cold; press it down if needed.
On windows with snow and ice, do not force the filter open or shut; check it once the ice has melted.

A window filter does not hold back gases. When chimney smoke is heavy and the smell is noticeable, it is best to keep the window shut.

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Last updated: 16 October 2026