Which is better for allergies?

The K&N. MERV 11 traps a finer range of particles than the Aircare's MERV 8, including more pollen, spores and fine dust. If your slot is 20x25, the Aircare is still a big step up from a basic fiberglass filter.

Both are permanent and last for years with washing. The K&N's pleated media holds more dust between cleanings, so it may go longer before it needs a wash. The Aircare's steel frame resists bending.

Will a MERV 11 filter strain my system?

Usually not on a standard residential blower, but MERV 11 is more restrictive than MERV 8. If your system is older or airflow is already weak, the Aircare's MERV 8 is the safer choice.

Can I use either one in place of the other?

No. They are different sizes: 20x25x1 versus 20x24x1. Measure your filter slot before ordering, since a one-inch difference in height means it will not seat.

Is stepping up to the K&N worth it?

Yes if it fits and you want better filtration. You get a higher MERV rating and a slightly better owner rating for the same washable, reusable approach.

How often should I wash a reusable filter?

Check it monthly and wash it when it looks loaded, typically every one to three months. A clogged filter of either brand cuts airflow and raises energy use.

Aircare 20x25x1 Washable Electrostatic Filter vs K&N 20x24x1 Furnace Air Filter

The K&N is the stronger filter: MERV 11 catches finer particles than the Aircare's MERV 8, and owners rate it slightly higher. The catch is size. The K&N is 20x24x1 and the Aircare is 20x25x1, so the right pick is the one that fits your return grille. Both are washable and reusable, so either replaces years of disposable filters.

Choose the Aircare if your filter slot is a true 20x25x1 and MERV 8 is enough for your home.
Choose the K&N if your slot is 20x24x1 and you want the higher MERV 11 filtration.

Prices

Aircare 20x25x1 Washable Electrostatic Filter: $31.99 at Amazon (last seen Nov 10)
K&N 20x24x1 Furnace Air Filter: $59.99 at Walmart (checked today)
Difference: the Aircare 20x25x1 Washable Electrostatic Filter is $28.00 cheaper than the K&N 20x24x1 Furnace Air Filter at the latest prices (Nov 10 and Nov 15)

Aircare 20x25x1 Permanent Washable Electrostatic HVAC Furnace Filter MERV 8

What separates them

	Aircare 20x25x1 Washable Electrostatic Filter	K&N 20x24x1 Furnace Air Filter
Nominal size	20x25x1 inches	20x24x1 inches
MERV rating	MERV 8	MERV 11
Media	Galvanized steel frame with electrostatic media	Pleated synthetic media
Reusability	Washable and permanent	Washable and reusable
Stated particle capture	Down to 1 micron, up to 94% of dust and allergens	Dust, pollen, bacteria, spores and allergens
Airflow	Low resistance, suited to standard 1-inch slots	Marketed for strong airflow on a MERV 11 media
Frame	Rigid galvanized frame, 3/8-inch undercut	Not specified in the listing
Owner rating	4.6 from 495 ratings	4.7 from 500 ratings

Specs compared

Spec	Aircare 20x25x1 Washable Electrostatic Filter	K&N 20x24x1 Furnace Air Filter
Nominal size	20x25x1 inches	—
MERV rating	MERV 8	—
Particle capture	down to 1 micron	—
Frame material	Rigid galvanized frame	—
Size tolerance	±1/8″	—
Weight	2 lbs	—
Nominal width	20 in	—
Nominal height	25 in	—
Nominal depth	1 in	—
Media type	Galvanized Steel	—
Width (")	—	20.0
Quantity (pcs)	—	1

Show all 15 specs

Spec	Aircare 20x25x1 Washable Electrostatic Filter	K&N 20x24x1 Furnace Air Filter
Filter Type	—	Dust Filter
Size	—	20x24x1
color	—	Unknown

Aircare 20x25x1 Washable Electrostatic Filter vs K&N 20x24x1 Furnace Air Filter

Prices

Aircare 20x25x1 Washable Electrostatic Filter vs K&N 20x24x1 Furnace Air Filter

Prices