How to clean air conditioning filters

Knowing how to clean air conditioning filters is essential for keeping the unit in good condition, improving indoor air quality and reducing energy consumption. Although many people use their air conditioning for months on end, few carry out the basic maintenance it needs to run efficiently.

In this guide, we explain how to clean air conditioning filters step by step and how often it is best to do it.

Why is it important to clean air conditioning filters?

Air conditioning filters are designed to trap dust, pollen, pet hair and other particles in the air. With use, this dirt builds up and hinders proper operation.

Regular cleaning helps to:

• Improve indoor air quality.
• Reduce the presence of allergens and bad smells.
• Maintain performance of the unit.
• Reduce electricity consumption.
• Prevent breakdowns and extend the system's working life.

Moreover, clean filters help the unit cool or heat more quickly and uniformly, meaning it has to work less hard.

How to remove and clean the filters in a split unit step by step

If you are wondering how to clean air conditioning filters, follow these simple steps:

1. Turn off the unit before carrying out any maintenance work.
2. Open the front cover of the indoor or split unit.
3. Remove the filters carefully, following the manufacturer's instructions.
4. Remove the surface dust using a vacuum cleaner or a soft brush.
5. Wash the filters with warm water and mild washing-up liquid, removing all the built-up dirt.
6. Rinse them thoroughly to avoid any soap residue.
7. Leave them to dry completely before putting them back in.
8. Refit the filters and close the cover.

It is important not to use abrasive products or a pressure washer, to avoid damaging the filter materials.

Maintaining the outdoor unit (compressor)

Cleaning the filters is essential, but it is also a good idea to check the outdoor air conditioning unit.

To keep the compressor in good condition:

• Remove leaves, dust and any other debris that may have built up on the surface.
• Check that the ventilation grilles are clear.
• Keep the area around the unit free of obstacles.
• Clean the exterior with a damp cloth whenever necessary.

If you notice strange noises, vibrations or a noticeable drop in performance, it is best to contact a professional for a more thorough check.

How often should the filters be cleaned?

How often you need to clean them will depend on how much the unit is used and the surrounding environmental conditions.

As a general guide:

• Heavy use during summer: every 2 to 4 weeks.
• Moderate use: once a month.
• Before the hot season: a full filter clean and general check-up.
• Professional maintenance: at least once a year.

In homes with pets, smokers or people with allergies, it may be necessary to clean them more often.

Now that you know how to clean air conditioning filters, you can add this simple task to your regular home maintenance routine. Spending a few minutes cleaning the filters helps improve air quality, optimise performance and reduce energy consumption. It is a small step that can make a big difference to both the comfort of your home and your electricity bill.