A washable, reusable HVAC air filter can replace years of throwaway filters. You measure once, buy one sturdy filter, and rinse it about once a month instead of tossing a new one in the trash.
Quick answer: To switch to a reusable HVAC air filter, copy the size printed on your old filter, buy a washable filter in that exact size, install it with the airflow arrow pointing toward the blower, and rinse and fully dry it about once a month.
Why switch to a reusable air filter?
Disposable filters are made to be thrown away, often several times a year. A reusable filter keeps that waste out of the landfill. But the bigger win for your home is simply keeping your filter clean. ENERGY STAR says to inspect, clean or change your air filter once a month, because a dirty filter can raise energy costs and damage your equipment, leading to early failure (ENERGY STAR).
There is one tradeoff to know. The EPA recommends a filter rated at least MERV 13, or as high as your system can handle, for better indoor air. MERV 13 filters must remove at least half of the smallest particles tested (EPA). Many washable filters have lower MERV ratings than that. If someone in your home has allergies or you live where wildfire smoke is common, compare ratings before you switch, or keep high-MERV disposable filters on hand for smoky days.
What you need
- Your old filter (to read its size)
- A washable or electrostatic reusable filter in the same exact size
- A garden hose or shower with a gentle spray
- A towel and a place to let the filter air-dry
- A calendar or phone reminder
How to switch to a reusable HVAC air filter
- Turn off your heating and cooling system at the thermostat.
- Pull out the old filter and write down the size printed on its frame, such as 16 x 25 x 1. Also note the MERV rating if it has one.
- Shop for a reusable filter in that exact size from a hardware store or online. Check the MERV rating and read the care instructions. Choose a sturdy frame that will not bend.
- Find the arrow on the new filter’s frame. Slide it in so the arrow points toward the blower motor and away from the return air vent.
- Turn the system back on and set a monthly reminder to check the filter.
- When it is time to clean, turn the system off, remove the filter, and rinse it with a gentle stream of water. Spray from the clean side to push dust out.
- Let it dry completely before putting it back. A damp filter can grow mold.
- If you want to keep the system running while the filter dries, keep a spare filter to use for that day.
Tips
- Check the filter monthly. During heavy heating or cooling seasons, or with pets, it may need cleaning more often.
- Never put a wet filter back in. Wait until it is fully dry, which can take several hours.
- Follow the maker’s care instructions. Some filters should not be washed with soap or hot water.
- Replace a reusable filter if the frame bends or the mesh tears.
Frequently asked questions
Are washable air filters as good as disposable ones?
They can work well at catching dust, but many have lower MERV ratings than high-efficiency disposable filters. If indoor air quality is your top concern, the EPA recommends MERV 13 or the highest your system can handle.
How often should I clean a reusable HVAC filter?
Check it once a month and clean it when you see a layer of dust. Homes with pets, lots of dust, or heavy air conditioning use may need more frequent cleaning.
How long do reusable air filters last?
Many are sold to last several years with regular cleaning. Check the maker’s guidance, and replace the filter if it gets damaged or no longer fits snugly.
Which way does the arrow go on an air filter?
The arrow shows the direction of airflow. Point it toward the furnace or air handler’s blower, away from the return vent where air enters.
See your home energy impact
A clean filter is one small part of an efficient home. Try our free Home Energy Simulator to see how heating, cooling and appliances add up in your home and which changes save the most.
Related guides
- How to Set a Monthly Reminder to Replace Your Furnace Filter
- How to Install a $25 Programmable Thermostat (and Skip the $250 Smart One)
- How to Check Your Attic Insulation with Just a Flashlight
Sources
- ENERGY STAR, Maintenance Checklist
- U.S. Environmental Protection Agency, Guide to Air Cleaners in the Home
Written and reviewed by the Accessible Sustainability Alliance editorial team. Last updated October 5, 2026.
