Last updated: November 24, 2025
When winter starts tapping at the windows and the last golden leaves are swept away by the wind, many of us begin to think more seriously about keeping warm. But the heating season isn’t just about radiators — it also brings significant changes to the air quality inside your home. Did you know that during this period, MVHR filters play a vital role in ensuring clean, healthy air for your family? Failing to replace them on time can affect both your wellbeing and your budget.
Why Should Filters Be Replaced in Autumn or at the Start of the Heating Season?
During the summer months, the air carries increased amounts of dust, pollen, smog and particles from traffic, building works and dry weather. All of this settles inside the filters. When autumn arrives and the MVHR system begins working more intensively, a clogged filter can no longer clean the air effectively — instead of freshness, you end up with stale, dusty and poorly circulated air.
Myths About “Fresh Air”
Many people still believe that simply opening a window is enough to bring in fresh air. Unfortunately, cold air is not the same as clean air. Even if you live near woodland, open windows still allow in fine dust, bacteria, pollen, mould spores and outdoor odours.
Moreover, in A+ energy-efficient homes, hygiene standards require that indoor air must be renewed at least three times per hour. And no — opening all the windows or creating a draught will not achieve this. Some areas will still remain poorly ventilated. An MVHR system, however, works strategically: it removes stale indoor air and supplies fresh, filtered air, helping maintain a healthy indoor microclimate.
What About Heat Loss and Energy Use?
When an MVHR filter becomes clogged, the system loses efficiency and must work harder, which increases electricity consumption. But that’s not the only issue. A dirty filter cannot clean the air properly, leading to a stuffy atmosphere indoors. Naturally, you may open the windows to “let in some fresh air”, but this also lets in the cold. Your home cools more quickly, the heating switches on more often, and your energy bills rise. In other words, not replacing the filters quietly becomes a costly habit.
The heating season is not only about warmer clothing — it also demands better air quality indoors. Replacing MVHR filters on time ensures fresher air, lower expenses, easier breathing and protection from invisible pollutants.
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