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FAQs: Maintenance

HOW OFTEN TO CLEAN AIR CONDITIONER FILTERS?

By Kyle Rafter - October 28, 2025

Knowing how often to clean air conditioner filters is important for keeping your unit working efficiently. As a rule of thumb, the filters should be cleaned at least once a month if you use your air conditioner daily. If you only use your unit occasionally, a filter clean once every three months is usually enough to maintain good airflow and performance.

Keeping your Fujitsu air conditioners filters clean also helps improve the quality of the air you breathe at home. A dirty or clogged filter makes your system work harder, which increases energy use and reduces the effectiveness of your air conditioner. Regular AC filter cleaning protects your system and ensures reliable comfort throughout the year.

Signs your filter may need cleaning sooner include:

  • Reduced airflow or weak cooling/heating

  • Unusual smells when the unit is running

  • Increased noise level when the unit is running 

  • A sudden increase in energy bills

If you notice any of these issues, it’s best to check your filters right away, rather than waiting until your next scheduled clean.

How to Clean AC Filters?

For anyone wanting to know the best way to clean aircon filters, the good news is that it’s a simple process. For wall air conditioners, floor console air conditioners and cassette units, the filters are located inside the unit itself. Most filters can be cleaned by gently washing them in warm water. Avoid harsh chemicals and make sure the filter is completely dry before reinstalling. Refitting a damp filter can lead to mould growth or damage to the unit. 

Making AC filter cleaning part of your routine will keep your system running smoothly and efficiently and help maintain cleaner indoor air.

How to Clean Ducted Air Conditioning Filters?

If you’re wondering how to clean ducted aircon units, the process is much the same. The filter is typically located in the return air grille on the ceiling. Carefully remove it, wash it with warm water and let it dry fully before reinstalling. Regular cleaning helps maintain airflow and efficiency across the entire home.

Most ducted filters can be cleaned at home, but if you’re unsure or the filter looks worn, professional help is recommended. 

If you’re not sure where your filter is located or need guidance on how to clean your air conditioner filter, check your unit’s manual or contact our team at [email protected] for support.

Kyle Rafter
General Manager, Product & Strategy at Fujitsu General Australia & New Zealand

Kyle has over 16 years experience within the air conditioning industry. Since joining Fujitsu General in 2015, Kyle has driven innovation and growth, leveraging his expertise in commercial business development. Passionate about cutting-edge technology, Kyle is dedicated to advancing sustainable solutions in the air conditioning sector.

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