How Often Should You Replace Your Air Conditioning Filters?

When it comes to keeping your air conditioning system running efficiently, few tasks are as simple, or as important, as changing the filters. It’s one of those small maintenance jobs that can make a huge difference to performance, air quality, and even energy bills. But how often should you replace your air conditioning filters? We’re going to talk you through.

Why Air Filters Matter

Your air conditioner’s filter has a vital job: it traps dust, pollen, pet hair, and other airborne particles before they can circulate through your home or clog up the system. Over time, however, those filters become saturated, making your AC work harder to pull air through. That means less cooling power, higher running costs, and potentially unnecessary strain on the unit.

General Rule of Thumb

For most households, replacing or cleaning filters every one to three months is a good guideline. The exact frequency depends on a few factors:

• Usage: If you run your air conditioning daily, especially in summer, aim to replace filters every month.
• Allergies or Pets: Homes with pets or allergy sufferers should replace filters more often to maintain clean air.
• Air Quality: If you live in a busy city like London or near a construction area, filters can clog faster.
• System Type: Some high-efficiency or reusable filters can last longer, but they still need regular cleaning.

Signs Your Filter Needs Changing

You don’t always have to wait for a set date to check your filters. Look out for these signs:

• Noticeably reduced airflow or uneven cooling.
• A musty smell when the system is on.
• More dust settling on furniture than usual.
• Increased energy bills with no clear reason.

If you spot any of these, it’s time for a change.

Protecting Your Investment

Replacing your air conditioning filters regularly isn’t just about comfort, it’s about protecting your system. A blocked filter forces your air conditioner to work harder, which can shorten its lifespan and lead to costly repairs down the line.

For homeowners scheduling air conditioning installation, it’s worth asking your installer which filters your system uses and how often they should be changed. A little guidance early on can save you a lot of hassle later.