Keeping your clean air quality starts with the right type of filter—and keeping that air filter clean. If you're using a washable or reusable air filter, you’ve probably wondered how often you really need to clean it. While reusable filters can be a good choice, they don’t work well if they don't get proper cleanings. A little effort and a regular maintenance schedule can keep your system working smoothly and your indoor air quality up to snuff.
How Often Should You Clean a Reusable Filter?
Most washable filters need regular cleaning about once a month. This can vary depending on where you live, how many people (and pets) are in your home, and how much dust or type of debris your system picks up.
"The cleaning frequency for washable filters depends heavily on your home's conditions, but many homeowners will find themselves cleaning these filters every month to maintain airflow," shared Shu Saito, Founder and CEO of All Filters LLC.
If you notice your system is running longer or a drop in airflow, your filter probably needs attention. Even if it doesn’t look dirty, it can still be full of fine dust and particles and not at peak efficiency. Shu explains that washable filters don’t hold as much as disposable air filters, which means they block airflow sooner. “This means you're not just cleaning them regularly, you're doing it more often than you might expect.”
If you’re not up for that kind of routine, it might not be the best long-term solution.
How to Clean Reusable Air Filters (Furnace or Air Conditioning)
Cleaning a washable HVAC filter is simple—but it has to be done right. Rinsing off the dust isn’t enough if you want the filter to actually keep doing its job.
“Any moisture left behind creates an ideal environment for mold growth and mildew, which defeats the purpose of filtration entirely,” reminds Shu.
Here's what to do during the cleaning process:
- Turn off your system.
- Remove the dirty filter carefully.
- Use a vacuum with a hose attachment to remove loose particles and excess dirt, or shake it outside for caked-on debris.
- Rinse the filter with water (not soapy water unless the filter manufacturer says it’s okay).
- This is a good time to look for signs of damage.
- Let it air dry fully—this can take hours.
- Once dry, reinstall it and turn your system back on.
A good tip: Have a second clean filter ready. That way, your system doesn’t sit idle while the first one dries.
Should You Switch to Replaceable Filters?
Reusable filters sound great—less environmental impact, less waste, fewer trips to the store—but they aren’t the best choice for everyone. They take time to clean, and you have to remember to do it often. For many people, life gets in the way. “While washable filters can work,” Shu says, “they require a level of maintenance commitment that many busy homeowners find challenging and frustrating to maintain consistently.”
If you find it hard to keep up with proper maintenance, switching to using replacement air filter products may save you time and effort. They're easier to change and more forgiving if you forget for a week or two. “For efficiency and effectiveness, replaceable filters typically provide better long-term value and peace of mind,” adds Shu.
Buying disposable filters in bulk can be cost friendly over time. “This investment more than pays for itself over the lifetime of your HVAC system," notes Shu. "It's one less thing to worry about, and your system performs better for it.”
FAQ
Can you vacuum a washable filter instead of rinsing it?
A vacuum cleaner can remove surface dirt, loose dust, and hair, but it doesn’t reach the fine dirt particles deep in the filter. Rinsing is still the better option if you want it to keep doing its job well.
Is it okay to run your HVAC without a filter while the washable one dries?
No. Running your system without a filter allows airborne particles and debris to enter your system. Unfiltered dust and debris can cause damage and lower air quality. That’s why it helps to have a second one ready to go during the washing process.
