Furnace Filters
Best 20x25x2 Furnace Filter (2026): Top 5 by the Specs
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 the best 20x25x2 furnace filter, the Filter King leads this list as Best Overall with MERV 8 pleated media in a 6-pack. The Filtrete adds MERV 11 with 3-in-1 technology, and the Nordic Pure gives MERV 12 in a 3-pack.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
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Best OverallFilter King 20x25x2 Air Filter MERV9.8 View on Amazon -
Runner-UpFiltrete 20x25x2 Air Filter9.7 View on Amazon -
Also GreatSimply 20x25x2 Air Filter9.6 View on Amazon -
Also GreatNordic Pure 20x25x2 Pleated MERV 12 Air9.5 View on Amazon -
Also GreatGlasfloss ZL 20x25x2 MERV 10 AC9.2 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. Filter King 20x25x2 Air Filter MERV | MERV 8 | 6-pack | — | — |
| 2. Filtrete 20x25x2 Air Filter | MERV 11 | — | — | — |
| 3. Simply 20x25x2 Air Filter | MERV 8 | 2-pack | — | — |
| 4. Nordic Pure 20x25x2 Pleated MERV 12 Air | MERV 12 | 3-pack | — | — |
| 5. Glasfloss ZL 20x25x2 MERV 10 AC | MERV 10 | — | — | — |
Filter King 20x25x2 Air Filter MERV
Its MERV 8 pleated media comes in a 6-pack sized 20x25x2 for furnace and air conditioner use.
- MERV rating: MERV 8
- Pack size: 6-pack
Good for
- Buyers who want MERV 8 filtration in a 6-pack
- Buyers who want a pleated filter for furnaces
Skip it if
- You want MERV 11 filtration
- You want a filter deeper than 2 inches
It uses pleated media to trap airborne particles without impacting air flow, and it slides in for fast replacement. Its actual size is 19.5 x 24.5 x 1.75, and it lasts up to 90 days before needing replacement. The 6-pack gives six filters for future changes for residential furnace and air conditioner use.
Filtrete 20x25x2 Air Filter
Its MERV 11 media with MPR 1000 uses 3-in-1 technology to pull in and trap particles.
- MERV rating: MERV 11
Good for
- Buyers who want MERV 11 filtration
- Buyers who want Smart App change reminders
Skip it if
- You want MERV 8 filtration
- You want a filter rated MERV 12
It uses 3-in-1 technology to pull in and trap unwanted particles from household air. Its exact size is 19.5 in x 24.5 in x 1.75 in, and it is a 3-month filter changed at least once every 90 days. The Filtrete Smart App sets 30-, 60- or 90-day reminders to change the filter.
Simply 20x25x2 Air Filter
Its MERV 8 electrostatically charged synthetic pleated media comes in a 2-pack, with a particle size of 3.0 to 10.0 microns.
- MERV rating: MERV 8
- Pack size: 2-pack
Good for
- Buyers who want MERV 8 filtration in a 2-pack
- Buyers who want a filter for homes and offices
Skip it if
- You want MERV 12 filtration
- You want a 6-pack of filters
Its actual size is 19.5 x 24.5 x 1.75, and it gives up to 3 months of filtration. The pack holds 2 filters with an installation guide for air conditioner and furnace use.
Nordic Pure 20x25x2 Pleated MERV 12 Air
Its MERV 12 pleated media comes in a 3-pack for advanced HVAC filtration.
- MERV rating: MERV 12
- Pack size: 3-pack
Good for
- Buyers who want MERV 12 filtration in a 3-pack
- Buyers who want a filter made in the USA
Skip it if
- You want MERV 8 filtration
- You want a 6-pack of filters
Its actual size is 19.5 x 24.5 x 1.75, and it is made in the USA. The 3-pack gives three filters for residential air conditioner and furnace use.
Glasfloss ZL 20x25x2 MERV 10 AC
Its MERV 10 pleated media pairs a heavy-duty frame with galvanized metal backing.
- MERV rating: MERV 10
Good for
- Buyers who want MERV 10 filtration
- Buyers who want a filter made in the USA
Skip it if
- You want MERV 12 filtration
- You want MERV 11 filtration
It gives MERV 10 efficiency with MERV 8 air flow and pressure drop, using pleated media on a galvanized metal backing. The frame is durable and heavy-duty, and the filter is made in the USA. Change it at least every 3 months for homes, businesses, schools and apartments.
How to choose
Match the exact size first
Nominal size is not exact size. All five filters list a nominal size of 20x25x2 and an actual size of 19.5 x 24.5 x 1.75, so measure your slot before ordering. A filter that is too small leaves gaps, and one that is too large will not seat. Compare the exact figures on your old filter with the figures in this guide.
Compare MERV and pack sizes
MERV figures in this guide run from 8 to 12. The Filter King and Simply filters are MERV 8, the Glasfloss is MERV 10, the Filtrete is MERV 11, and the Nordic Pure is MERV 12. Pack sizes differ: the Simply 2-pack, the Nordic Pure 3-pack, the Filter King 6-pack, and the Glasfloss 12-pack.
Plan changes and reminders
The Filter King lasts up to 90 days, the Filtrete is a 3-month filter changed at least once every 90 days, the Simply gives up to 3 months of filtration, and the Glasfloss is changed at least every 3 months. The Filtrete Smart App sets 30-, 60- or 90-day reminders to change the filter. Keep a spare pack on hand so a change is never delayed.
FAQ
What exact size fits a 20x25x2 slot?
All five filters list a nominal size of 20x25x2 and an actual size of 19.5 x 24.5 x 1.75. Measure your slot and compare it with the exact size before ordering.
Which MERV rating should I choose?
MERV figures here run from 8 to 12: MERV 8 on the Filter King and Simply, MERV 10 on the Glasfloss, MERV 11 on the Filtrete, and MERV 12 on the Nordic Pure. Match the rating to the particles you want captured.
What filter change timing do these picks state?
The Filter King lasts up to 90 days, the Filtrete is changed at least once every 90 days, the Simply gives up to 3 months, and the Glasfloss is changed at least every 3 months.
Do any of these filters have app reminders?
The Filtrete Smart App sets 30-, 60- or 90-day reminders to change the filter, so you can pick the interval that fits your routine.
