How To Clean An AC Filter

It’s easy to take air conditioning for granted until it’s not working as well as it should on a hot day. Barring any big mechanical issues, it could just be that your AC filter needs a good cleaning. 

You might not realize it when you look at it, but that mesh AC filter is a powerful weapon in the fight to keep dust, dirt, and allergens out of your home. To ensure continuous, cool airflow, clean that filter before AC season starts—and do it more if you have allergies or respiratory issues. 

Fortunately, even the most reticent DIYer can learn how to clean an AC filter easily.

Before Getting Started

You’ll need to turn off your AC unit to remove the filter, so it’s always best to time this task when it’s not too hot out. You’ll also need to let the filter air dry before reinstalling, so timing is key.

It’s also a good idea to double check that your AC filter is a reusable one that can be subject to water; otherwise, find out if you need to replace your filter completely.

What You’ll Need

Running water
Bucket or basin
Mild dish soap
Soft brush or sponge
Towels for drying

How To Clean An AC Filter

Choose from either one of these simple methods to clean your air filter and keep that clean, cool airflow coming.

Method 1: Rinsing The Filter

This method is best if you are already on a regular maintenance schedule with your AC filter.

1. Shut off the AC unit and carefully remove the filter.
2. Rinse the filter under running water. Gently rub the mesh filter with your fingers to remove any dirt and debris.
3. Give the filter a gentle shake to get rid of excess water, then prop it up on a towel or other surface and let it air dry completely.

Method 2: Soaking And Scrubbing The Filter

If you’ve been lax with AC maintenance or your AC unit faces a busy street with lots of car traffic, for example, then you should use a bit more elbow grease to get rid of the dust, dirt, and debris.

1. Shut off the AC unit and carefully remove the filter.
2. Fill a bowl, basin, or even your sink with warm water and add some mild dish soap to create some suds.
3. Submerge the AC filter in the water and let soak for a few minutes.
4. With a soft brush or sponge, gently scrub the filter to remove stuck-on dirt or debris.
5. Once you are satisfied with your scrubbing, rinse the filter under running water to remove all the soap residue.
6. Give the filter a gentle shake to get rid of excess water, then prop it up on a towel or other surface and let it air dry completely.

Health And Safety Concerns

Staying cool is key, but air quality is even more important when it comes to air conditioner maintenance. Your AC filter might not look like much, but it’s working hard to filter the bad stuff out of your air. 

If you have allergies and have been wondering why you’re sneezing more, even indoors, it could be a dirty AC filter. It’s important to clean it at least once a season, but consider doing it monthly when you’re actively using it.