Are Washable HVAC Filters Worth It? The Trade-Offs in Numbers
Are washable HVAC filters worth it? Most are MERV 8, below EPA's MERV 13 suggestion. What they catch, cleaning and drying, mold risk, and who they suit.
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Washable HVAC filters are worth it only if your priority is less waste and you are content with basic filtration. The washable 16x25x1 filters we found on Amazon were rated MERV 8, such as the REAIR washable filter. By EPA's MERV table, MERV 8 captures at least 70% of 3 to 10 micron particles and 20% of 1 to 3 microns, with no minimum for the 0.3 to 1 micron particles in smoke. EPA suggests at least MERV 13, which must catch 50% or more of those.
For allergies, smoke or anyone with breathing concerns, a disposable MERV 13 such as the Filtrete MPR 1900 filters far better. Washables also need thorough drying before reinstalling, or they can grow mold.
What washables catch
| Particle size | Washable MERV 8 | Disposable MERV 13 |
|---|---|---|
| 0.3 to 1 µm (smoke, fine dust) | No minimum | 50% |
| 1 to 3 µm | 20% | 85% |
| 3 to 10 µm (pollen, large dust) | 70% | 90% |
The case for washables
- Less waste. REAIR's listing claims one washable replaces up to 60 disposables.
- Low airflow resistance. REAIR lists a pressure drop of 0.38 inches of water at 1,367 cfm, tested to ASHRAE 52.2, which suits restrictive systems.
- Long warranty. REAIR lists a 5-year warranty.
The case against
- Lower filtration. MERV 8 is well below EPA's suggested MERV 13 and does little for smoke-size particles.
- Cleaning effort. A filter only works while clean; EPA says a dirty, overloaded filter will not work well, and EPA's technical summary notes that excessive loading can push air around the filter.
- Drying time and mold. A filter put back damp sits in a dark, airflow-fed spot. EPA's mold guidance says wet materials should be dried within 24 to 48 hours to prevent mold growth; a damp filter in the return is the wrong place to test that.
- Charge fades. EPA's technical summary says electrostatically charged media tend to lose efficiency as they load and the charge diminishes. Washables are often marketed as electrostatic; whether washing restores performance is the maker's claim.
If you use a washable filter
- Follow the maker's cleaning instructions and interval.
- Dry it completely before reinstalling; keep a second filter in rotation if drying takes longer than a day.
- Install it with the airflow arrow pointing toward the furnace, as EPA advises for all filters.
- Inspect the frame and seals; EPA says gaps that let air bypass the filter significantly decrease effectiveness.
Cost comparison
A washable filter costs more up front than one disposable but nothing per change, while MERV 13 disposables cost more per filter than basic MERV 8 disposables. EPA says makers typically suggest replacing disposables every 60 to 90 days, so a home buys four to six a year. If you would otherwise buy MERV 8 disposables, a washable MERV 8 saves money and waste. If you would buy MERV 13, the comparison is not like for like: the washable is cheaper because it filters less.
Who should use which
- Washable MERV 8 for a rental, a garage or workshop system, a very restrictive system, or anyone prioritizing waste reduction without allergy or smoke concerns.
- Disposable MERV 11 to 13 for allergies, pets, wildfire regions, or anyone with breathing concerns. See the best HVAC filters for allergies and the best HVAC filters.
For how electrostatic media work, see electrostatic air filters explained; for timing, the HVAC filter replacement schedule.
Frequently asked questions
Are washable furnace filters good?
They are adequate for large dust and pollen. The washable 16x25x1 filters we found were MERV 8, which EPA's table shows has no minimum capture for the smallest, smoke-size particles.
What MERV are washable filters?
The washable 16x25x1 filters we checked on Amazon, including REAIR's, were rated MERV 8.
Do washable filters save money?
Compared with MERV 8 disposables, usually yes. Compared with MERV 13 disposables, they cost less because they filter less.
How often should I wash a reusable filter?
Follow the maker's interval. EPA says dirty, overloaded filters do not work well, so clean it before it looks heavily loaded, and dry it fully before reinstalling.
Can a washable filter grow mold?
If reinstalled damp, it can. EPA says wet materials should be dried within 24 to 48 hours to prevent mold; keep a spare in rotation so each filter dries completely.
Are washable filters better for my HVAC system?
They often have low airflow resistance; REAIR lists 0.38 inches of water at 1,367 cfm. That helps restrictive systems, but at the cost of fine-particle capture.
Sources
- What is a MERV rating?, US Environmental Protection Agency
- Guide to Air Cleaners in the Home, US Environmental Protection Agency
- Residential Air Cleaners: A Technical Summary (3rd edition), US Environmental Protection Agency
- A Brief Guide to Mold, Moisture and Your Home, US Environmental Protection Agency
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