How to Clean a Washable HVAC Air Filter

If you own a home, you’re probably used to installing a new furnace filter every couple of months to keep your HVAC system running efficiently. But did you know some air filters are designed to be washed and reused? It's true. Washable HVAC air filters are incredibly convenient, cost friendly, and better for the environment. HVAC.com explains how to clean a washable HVAC air filter.

What Is a Washable Air Filter?

A washable air filter is exactly what it sounds like: an air filter that you can clean and reuse multiple times. Reusable filters last about 5-10 years on average depending on the type and how well they’re maintained. Most HVAC systems are designed to use either disposable or washable air filters.

Unlike disposable filters that need to be replaced periodically (typically every 2-3 months), washable filters are made from durable materials like aluminum mesh, polypropylene, or synthetic fibers that can withstand the cleaning process. Like disposable air filters, they’re designed to capture dust, dirt, and other airborne particles to protect your HVAC system and keep it running efficiently.

There are several reasons to consider using washable filters. First, they’re eco-friendly, which reduces the waste associated with disposable filters. They can also be more cost-effective over time since you’re not constantly buying replacements. Plus, well-maintained washable filters are durable and can improve airflow which may extend your HVAC system’s lifespan and lower energy costs.

When to Clean a Reusable HVAC Filter

Washable filters should be cleaned when they become clogged and dirty with dust and grime, typically about every 1-3 months, or according to the manufacturer’s guidelines. Cleaning intervals can vary based on how often your HVAC system is used and your specific environment. If you live with pets or suffer from allergies, for example, you should clean the filter more frequently.

A Step-by-Step Guide to Cleaning Washable HVAC Filters

Cleaning a washable air filter is a straightforward task that can be done in a few simple steps. Here’s how you can do it:

1. Turn Off the HVAC System: Make sure your HVAC system is turned off before you remove the air filter. This prevents unfiltered dust and other particles from circulating in the system and your air supply. You can turn the system off at the thermostat.
2. Locate and Remove the Filter: Find your air filter and remove it. It’s usually located between the return air duct and the air handler. Depending on your system, it might be held in place by clips or screws which you’ll need to remove.
3. Vacuum the Filter (Optional): Before you get the filter wet, consider using a vacuum cleaner with a brush attachment to remove loose dust and debris. This eliminates surface dirt and makes the washing process more effective.
4. Wash the Filter: Use lukewarm water and a mild detergent to thoroughly clean the air filter. Gently scrub the filter with a soft bristled brush, cloth, or sponge, being careful not to damage the filter media. If the filter is very dirty, you might need to let it soak for a few minutes.
5. Rinse Thoroughly: Rinse the filter under lukewarm water until all the soap and dirt are washed away. It’s important to remove all of the detergent because leftover soap can attract more dust.
6. Dry the Filter: Let the filter air dry completely before reinstalling it.
7. Reinstall the Filter: Once the filter is dry, put it back into its place in the HVAC system. Make sure it’s positioned exactly as it was before, and resecure any clips or screws if necessary.

When to Replace Your Reusable HVAC Filter

Unfortunately, over time, your washable air filter will suffer the same fate as a disposable fate and will need to be thrown away. Consider buying a new washable HVAC filter if you notice a significant drop in airflow, or if the filter appears visibly dirty and clogged despite cleaning. Additionally, if your HVAC system is running less efficiently or if you experience increased dust or allergens in your home, it may be time for a replacement.