Furnace Filters
Best 24x24x2 Furnace Filters (2026): 3 Picks Compared
As an Amazon Associate we earn from qualifying purchases. Specs below come from each product's Amazon listing; we do not test products in person.
For furnace filters, the Filtrete leads as Best Overall: it pairs a MERV 11 rating with a 1000 MPR, a 2-pack, and 90-day changes. The Glasfloss Runner-Up adds a MERV 10 rating in a 3-pack, and the Filter King adds a MERV 8 rating with a 24x24x2 nominal size.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
-
Best OverallFiltrete 24x24x1 Air Filter9.8 View on Amazon -
9.4 View on Amazon -
Also GreatFilter King 24x24x2 Air Filter MERV9.2 View on Amazon
Compare the specs
Ranked on pack size from each listing, plus how many buyers have rated it. A dash (—) means we could not confirm that figure from the listing.
| Pick | MERV rating | Pack size | Weight | Warranty |
|---|---|---|---|---|
| 1. Filtrete 24x24x1 Air Filter | MERV 11 | 2-pack | — | — |
| 2. Glasfloss ZL 20x24x2 MERV 10 Pleated Air | MERV 10 | 3-pack | — | — |
| 3. Filter King 24x24x2 Air Filter MERV | MERV 8 | — | — | — |
Filtrete 24x24x1 Air Filter
It pairs a MERV 11 rating with a 1000 MPR, a 2-pack, and Filtrete 3-in-1 technology.
- MERV rating: MERV 11
- Pack size: 2-pack
Good for
- Buyers who want a MERV 11 filter in a 2-pack
- Buyers who want Smart App reminders
Skip it if
- You want a MERV rating above MERV 11
- You want a filter 2 inches thick
It carries a MERV 11 rating with a 1000 MPR in a 2-pack for 3-month changes. It uses Filtrete 3-in-1 technology to pull in and trap particles, with a pleated polypropylene build. The nominal size is 24x24x1 with an actual size of 23.68 by 23.68 by 0.81 inches, and it captures dust and lint. Change the filter at least once every 90 days, and the Filtrete Smart App sets 30-, 60- or 90-day reminders.
Glasfloss ZL 20x24x2 MERV 10 Pleated Air
It pairs a MERV 10 rating with a 3-pack, a heavy-duty frame, and a 20x24x2 nominal size.
- MERV rating: MERV 10
- Pack size: 3-pack
Good for
- Buyers who want a MERV 10 filter in a 3-pack
- Buyers who want a filter made in the USA
Skip it if
- You want a MERV rating above MERV 10
- You want a 24x24 nominal size
It carries a MERV 10 rating in a 3-pack with a nominal size of 20x24x2 and an exact size of 19-3/8 by 23-3/8 by 1-3/4 inches. It has a durable heavy-duty frame, a pleated build, and a metal material. It works for air conditioners and furnaces, and it is made in the USA.
Filter King 24x24x2 Air Filter MERV
It pairs a MERV 8 rating with a 24x24x2 nominal size, a pleated design, and up to 90 days of use.
- MERV rating: MERV 8
Good for
- Buyers who want a MERV 8 filter
- Buyers who want a 24x24x2 nominal size
Skip it if
- You want a MERV rating above MERV 8
- You want a 20x24 nominal size
It carries a MERV 8 rating with a nominal size of 24x24x2 and an actual size of 23.75 by 23.75 by 1.75 inches. It has a pleated design with a polypropylene material, and it installs by opening, sliding, and closing. It can last up to 90 days before needing replacement, and it captures dust and airborne particles.
How to choose
MERV ratings in this list
MERV ratings here run from MERV 8 to MERV 11, and a higher number means finer particle capture. The Filtrete carries MERV 11 with a 1000 MPR, the Glasfloss carries MERV 10, and the Filter King carries MERV 8. Compare the rating with the particles you want captured, such as dust and lint, and check the size before you buy.
Nominal size versus actual size
The Filtrete nominal size is 24x24x1 with an actual size of 23.68 by 23.68 by 0.81 inches. The Glasfloss nominal size is 20x24x2 with an exact size of 19-3/8 by 23-3/8 by 1-3/4 inches, and the Filter King nominal size is 24x24x2 with an actual size of 23.75 by 23.75 by 1.75 inches. Measure your slot before ordering, and match the nominal size.
Change intervals and pack sizes
Change intervals here are 90 days for the Filtrete, with Smart App reminders at 30, 60 or 90 days, and up to 90 days for the Filter King. The Filtrete comes in a 2-pack and the Glasfloss comes in a 3-pack, so count the filters you need before you buy.
FAQ
What MERV ratings do these filters carry?
The Filtrete carries MERV 11, the Glasfloss carries MERV 10, and the Filter King carries MERV 8.
What sizes do these filters come in?
The Filtrete is 24x24x1 with an actual size of 23.68 by 23.68 by 0.81 inches. The Glasfloss is 20x24x2 with an exact size of 19-3/8 by 23-3/8 by 1-3/4 inches, and the Filter King is 24x24x2 with an actual size of 23.75 by 23.75 by 1.75 inches.
When should the Filtrete and Filter King be changed?
Change the Filtrete at least once every 90 days, with Smart App reminders at 30, 60 or 90 days. The Filter King can last up to 90 days before needing replacement.
