During winter, indoor air quality often gets worse without us noticing. Windows stay closed to keep homes warm and heating systems run for most of the day. Dust, pet hair and fine particles build up more easily and stay trapped indoors.
This is when your air purifier works hardest. According to the US Environmental Protection Agency, air cleaners can help reduce indoor air pollution, especially when ventilation is limited during colder months. Regular air purifier cleaning during winter helps maintain performance and supports healthier indoor air throughout the colder months.
Why Indoor Air Quality Matters More in Winter
Winter changes how air circulates inside the home. Heating systems push warm, dry air through rooms, lifting dust from carpets, furniture and soft furnishings. With lower humidity and limited ventilation, particles stay airborne for longer instead of settling.
This puts extra pressure on air purifiers during winter.
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Indoor air recirculates for long periods
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Heating systems disturb settled dust and allergens
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Dry air allows fine particles to remain airborne
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Closed windows limit fresh air exchange
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More time spent indoors increases everyday pollutants
For this reason, winter is one of the most important seasons for air purifier maintenance.
Clean the Pre-Filter Regularly
The pre-filter is the first stage of your air purifier’s filtration system. It captures larger particles before they reach the main filter. In winter, the pre-filter can clog more quickly, so regular cleaning helps maintain airflow and efficiency.
Most Coway air purifiers make pre-filter cleaning simple.
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Cylindrical pre-filters should be vacuumed or wiped gently with a damp cloth
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Square or rectangular pre-filters can usually be vacuumed or rinsed with water
Let the pre-filter dry completely before placing it back into the purifier to help maintain smooth and quiet operation.
Check Your Air Purifier Filter More Often
The pre-filter is the only washable part of an air purifier. The main filter should never be washed or reused.
During winter, higher dust levels may mean you need air purifier filter replacement sooner than expected. If your purifier runs at higher fan speeds or the filter indicator lights up, it is time to replace the filter.
Replacing the filter on time helps maintain consistent airflow and accurate air quality readings, which is especially important during winter.
If you find it hard to remember replacement schedules, a filter subscription can help keep maintenance on track.
Keep Airflow Areas Clear
Air purifier performance depends on good airflow. Winter dust often gathers near floors, skirting boards and vents, so wiping down the outside of the unit can make a noticeable difference.
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Leave enough space around the purifier
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Keep air intake and outlet areas clear
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Clean around any particle or air quality sensors
Simple, regular cleaning supports long term performance.
Let Your Air Purifier Run Consistently
In winter, air purifiers are most effective when they run regularly. Continuous use helps prevent dust, allergens and fine particles from settling and being recirculated.
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Auto mode adjusts fan speed based on real time indoor air quality
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Sleep mode allows quiet filtration overnight
Consistent use is one of the easiest ways to support better indoor air quality during winter.
Frequently Asked Questions
How often should I clean my air purifier pre-filter in winter?
Every two to four weeks, depending on dust levels and pets.
Do air purifier filters need replacing more often in winter?
They can. Heavier dust and indoor pollutants may shorten filter lifespan.
Can I wash my air purifier filter?
Only the pre-filter is washable. The main filter must be replaced.
Why does my air purifier run more in winter?
Indoor pollutants increase while ventilation decreases, so the purifier adjusts to maintain air quality.
Supporting Cleaner Indoor Air All Year Round
Maintaining your air purifier is one of the simplest ways to support better indoor air quality. Explore Coway Airmega air purifiers and discover how thoughtful design and regular care help create a healthier home throughout every season.
