Best Cheap Air Filter

#1 · Best Overall

1. Amazon Basics 20×25 Filter

• Dimensions: 24.75"L x 19.75"W x 0.75"Th
• Weight: 3.6 lb
• Material: Synthetic
• Compatible Devices: Furnace

Best for: Large-format furnace six-pack.

Why it ranks #1: Its MERV 8 rating and six-pack suit routine replacement needs for systems taking 20x25x1 filters; the listing gives an actual size of 19.75 by 24.75 by 0.75 inches.

A six-pack in the 20x25x1 format makes this Amazon Basics filter a practical option for furnace owners who want replacements on hand. The MERV 8 rating, electrostatic construction, and listed actual size of 19.75 by 24.75 by 0.75 inches help define its filtration and fit.

The six-filter quantity can reduce the need to source replacements one at a time, while the actual dimensions help buyers check the slot against this nominal 20x25x1 filter. MERV 8 and electrostatic construction are specified, and the product description says its synthetic media is designed to capture household irritants. The description also lists a beverage board frame and wire mesh support. Furnace is the listed compatible device, so do not assume other appliance compatibility.

Skip it if you need an air-conditioner-compatible listing; the 16x24x1 Aerostar MERV 8 is listed for both air conditioners and furnaces if its size fits.

Select this Amazon Basics pack for a furnace requiring the stated 20x25x1 format and MERV 8 rating. Compare its actual dimensions with the existing filter, and keep in mind that compatibility is listed for furnaces.

Listed on Amazon as: Amazon Basics 20x25x1 Air Filter 6-Pack, MERV 8 AC Furnace Filters, Removes Dust, Electrostatic, Allergen Control (Actual Size: 19.75" x 24.75" x 0.75")

#2 · Common Size Pick

2. Amazon Basics 16×20 Filter

• Dimensions: 19.75"L x 15.75"W x 0.75"Th
• Weight: 2.6 lb
• Material: Mesh
• Compatible Devices: Furnace

Best for: Six-pack for 16×20 furnace slots.

Why it ranks #2: This MERV 8 six-pack covers dust, lint, and pollen, and its listed actual size is 15.75 by 19.75 by 0.75 inches for a matching system.

The 16x20x1 title size and six-filter pack make this Amazon Basics option a straightforward choice for furnace owners seeking MERV 8 replacements. Its listed actual dimensions are 15.75 by 19.75 by 0.75 inches, and the description identifies electrostatically charged synthetic filter media for capturing household irritants.

Six filters provide a supply of replacements for a furnace that uses the listed format, while the actual dimensions let buyers compare the filter with their existing slot. The MERV 8 rating identifies its stated filtration level, and the product description says the electrostatically charged synthetic media is designed to capture household irritants. A beverage board frame and wire mesh support are also described. The listed compatible device is a furnace, so check system compatibility before selecting it.

Skip it if you need an air-conditioner-compatible listing; the 16x24x1 Aerostar MERV 8 is listed for air conditioners and furnaces if that size fits.

This Amazon Basics pack suits furnace owners whose filter slot matches the listed 16x20x1 format and actual measurements. Its MERV 8 rating and six-filter quantity are useful selection details, but compatibility is listed for furnaces.

Listed on Amazon as: Amazon Basics 16x20x1 Air Filter 6-Pack, MERV 8 AC Furnace Filters, Allergen Control , Removes Dust, Lint and Pollen, Electrostatic (Actual Size: 15.75" x 19.75" x 0.75")

#3 · Dust and Pollen Pick

3. Amazon Basics 14×20 Filter

• Dimensions: 19.75"L x 13.75"W x 0.75"Th
• Weight: 2.3 lb
• Material: Mesh
• Compatible Devices: Furnace

Best for: 14×20 furnace six-pack.

Why it ranks #3: A six-pack of MERV 8 filters is listed for dust, pollen, and lint control; its actual dimensions are 13.75 by 19.75 by 0.75 inches.

A six-pack in the 14x20x1 format gives furnace owners a ready supply of Amazon Basics MERV 8 replacements. The listed actual dimensions are 13.75 by 19.75 by 0.75 inches, and the title identifies dust, pollen, and lint as the particles this electrostatic filter is intended to remove.

The six-filter quantity helps keep replacements available for a furnace using this format, while the actual measurements make it possible to compare the filter with the existing one. Its MERV 8 rating and electrostatic construction are specified, and the title identifies dust, pollen, and lint removal. Furnace is the listed compatible device, so buyers should treat that as the stated use rather than assume compatibility with an air conditioner. Check dimensions before selecting it.

Skip it if you need an air-conditioner-compatible listing; the 16x24x1 Aerostar MERV 8 is listed for both appliance types if its size fits.

Choose this Amazon Basics pack for a furnace whose slot matches the 14x20x1 format and actual dimensions. Its six-filter quantity and MERV 8 rating are specified, while air-conditioner compatibility is not listed.

Listed on Amazon as: Amazon Basics 14x20x1 Air Filter, MERV 8 AC Furnace Filters, Allergen Control , Electrostatic, Removes Dust Pollen and Lint, 6-Pack (Actual Size: 13.75" x 19.75" x 0.75")

#4 · Residential and Commercial

4. Aerostar 16×24 Filter

• Dimensions: 23.75"L x 15.75"W x 0.75"Th
• Weight: 3 lb
• Material: Synthetic
• Compatible Devices: Air Conditioner, Furnace

Best for: Commercial and residential HVAC.

Why it ranks #4: The MERV 8 six-pack is listed for both residential and commercial HVAC systems, with actual dimensions of 15.75 by 23.75 by 0.75 inches.

Its stated compatibility with both commercial and residential HVAC systems sets this Aerostar apart for buyers choosing a 16x24x1 MERV 8 filter. The six-pack supplies multiple replacements, while synthetic filter material and compatibility with furnaces and air conditioners clarify its intended equipment and use.

The commercial and residential HVAC listing gives this filter a wider stated system scope than options specified only for residential use. It is also listed for both furnaces and air conditioners, allowing either appliance type when the size and system requirements match. A six-pack provides replacements to keep available, and the synthetic material plus MERV 8 rating identify the filter construction and filtration level. Its actual dimensions are 23.75 by 15.75 by 0.75 inches.

Skip it if you need a smaller 12x12x1 filter; the 12x12x1 Aerostar MERV 8 fits that format if its listed actual dimensions suit your slot.

Consider this Aerostar for a commercial or residential HVAC system that takes its 16x24x1 format and a MERV 8 filter. Check the listed actual dimensions and system requirements before choosing the six-pack.

Listed on Amazon as: Aerostar Air Filter 16x24x1 MERV 8 AC Filter, HVAC, Furnace Filter, 6 Pack

#5

5. Amazon Basics 14×14 Filter

• Dimensions: 13.75"L x 13.75"W x 0.75"Th
• Weight: 1.6 lb
• Material: Mesh
• Compatible Devices: Furnace

Best for: Compact furnace six-pack.

Why it ranks #5: This MERV 8 six-pack fits shoppers needing the less common listed 14×14 size; the actual measurements are 13.75 by 13.75 by 0.75 inches.

Its actual dimensions of 13.75 by 13.75 by 0.75 inches distinguish this Amazon Basics filter from nominal 14x14x1 sizing and help buyers check fit before ordering. The six-pack carries a MERV 8 rating and an electrostatically charged synthetic filter medium, for compatible furnace use.

The six-filter set gives furnace owners replacements to keep available, while the stated actual dimensions help with checking the filter slot against the nominal 14x14x1 title size. MERV 8 and electrostatically charged synthetic filter media are specified, and the product description says it is designed to capture household irritants. A beverage board frame and wire mesh support are also listed. Compatibility is specified for furnaces, so buyers should not assume other appliance compatibility.

Skip it if you need an air-conditioner-compatible listing; the 12x12x1 Aerostar MERV 8 is listed for both air conditioners and furnaces if its size fits.

Pick this Amazon Basics pack for a furnace using the listed compact dimensions and MERV 8 format. Its actual measurements differ from the nominal title size, so compare them with the filter slot before buying.

Listed on Amazon as: Amazon Basics 14x14x1 Air Filter, MERV 8 AC Furnace Filters, Allergen Control , Electrostatic, Air Cleaning, 6-Pack (Actual Size: 13.75" x 13.75" x 0.75")

#6

6. Amazon Basics 12×12 MERV 8

• Dimensions: 11.75"L x 11.75"W x 0.75"Th
• Weight: 16 oz
• Material: Fiberglass
• Compatible Devices: Furnace

Best for: Compact MERV 8 furnace pack.

Why it ranks #6: The six-pack provides MERV 8 filtration for a 12×12 opening, with actual dimensions of 11.75 by 11.75 by 0.75 inches.

This Amazon Basics 12x12x1 filter pairs a MERV 8 rating with a six-pack, giving furnace owners a defined format and multiple replacements to keep available. Its listed actual size is 11.75 by 11.75 by 0.75 inches, while the title specifies dust, pet, and allergen control.

The six-filter quantity helps keep replacements on hand for a furnace using this size, and the actual dimensions provide a concrete fit check against the existing filter. The title identifies dust, pet, and allergen control, while MERV 8 and electrostatic construction are stated. The product description also mentions a beverage board frame and wire mesh support, though its material field lists fiberglass. Furnace is the specified compatible device, so use that listing to guide appliance selection.

Skip it if you want a stated MERV 11 rating in the same nominal size; the 12x12x1 Amazon Basics MERV 11 is a better fit if its details match your needs.

Consider this pack for a furnace that takes the stated 12x12x1 format and a MERV 8 filter. Its six-filter quantity and actual measurements aid selection; the listed compatible device is a furnace.

Listed on Amazon as: Amazon Basics 12x12x1 Air Filter 6-Pack, MERV 8 AC Furnace, Dust, Pet & Allergen Control , Electrostatic (Actual Size: 11.75" x 11.75" x 0.75")

#7 · Highest MERV Rating

7. Amazon Basics 12×12 MERV 11

• Dimensions: 11.75"L x 11.75"W x 0.75"Th
• Weight: 1.2 lb
• Compatible Devices: Furnace

Best for: MERV 11 compact furnace filter.

Why it ranks #7: Its MERV 11 rating is the highest among the listed products, and the six-pack has actual dimensions of 11.75 by 11.75 by 0.75 inches.

MERV 11 is the key distinction of this Amazon Basics 12x12x1 filter, which also names dust, pets, allergens, pollen, and lint in its title. Its six-pack and 11.75-by-11.75-by-0.75-inch actual dimensions give furnace owners practical details for planning replacements and checking fit.

The MERV 11 rating gives buyers a stated filtration level to compare with lower-rated options, while the title calls out dust, pet, and allergen control and removal of pollen and lint. Six filters come in the pack, providing replacements to keep on hand. The listed compatible device is a furnace. Actual dimensions are 11.75 by 11.75 by 0.75 inches, so compare those measurements with the existing filter and slot before ordering.

Skip it if you need an air-conditioner-compatible listing; the 12x12x1 Aerostar MERV 8 is listed for both air conditioners and furnaces if its size fits.

This pack suits furnace owners seeking a MERV 11 filter in a compact 12x12x1 format. Check the actual dimensions against your slot, and note that the listed compatible device is a furnace.

Listed on Amazon as: Amazon Basics 12x12x1 Air Filter 6-Pack, MERV 11 AC Furnace Filters, Dust, Pet, Allergen Control , Removes Pollen and Lint (Actual Size: 11.75" x 11.75" x 0.75")

#8

8. Filtrete 20×25 Filter

• Dimensions: 24.69"L x 19.69"W x 5.25"Th
• Weight: 16 oz
• Material: Polypropylene
• Compatible Devices: Air Conditioner, Furnace

Best for: Six-filter residential replacement.

Why it ranks #8: This six-pack matches a 20x25x1 nominal size and lists MERV 5; it offers a lower stated filtration rating than the MERV 8 options.

Six filters in one set make this Filtrete a practical choice for households that want replacement elements ready for a compatible residential furnace or air conditioner. Its 20x25x1 title size identifies the intended filter format, while the MERV 5 rating gives buyers a clear filtration level to weigh against their needs.

The six included filters let you keep replacements on hand for a compatible residential HVAC system, rather than sourcing each one separately. Filtrete lists both air conditioners and furnaces as compatible devices, so the filter can suit either type of listed equipment when the required size matches. Its MERV 5 rating is a key selection point: buyers prioritizing a higher listed rating may prefer a different option. Check the system’s required dimensions before choosing this 20x25x1 format.

Skip it if you want a higher stated filtration rating; the 16x25x1 Filtrete MERV 11 is a better fit if its size matches.

Choose this Filtrete set if your residential furnace or air conditioner takes the stated 20x25x1 format and you want six replacements on hand. Its MERV 5 rating is the boundary to consider when selecting filtration.

Listed on Amazon as: Filtrete 20x25x1 Air Filter, MERV 5, MPR 300, 6 HVAC Filters

#9

9. Aerostar 12×12 Filter

• Dimensions: 11.75"L x 11.75"W x 0.75"Th
• Weight: 1.1 lb
• Material: pleated
• Compatible Devices: Air Conditioner, Furnace

Best for: Small-format HVAC replacement.

Why it ranks #9: The MERV 8 four-pack serves systems requiring a 12x12x1 filter, with listed actual dimensions of 11.75 by 11.75 by 0.75 inches.

Compatibility with both air conditioners and furnaces makes this Aerostar a flexible option for a system that takes a 12x12x1 MERV 8 filter. Four pleated filters are included, and their listed actual dimensions of 11.75 by 11.75 by 0.75 inches help buyers check the required fit.

Aerostar lists both air conditioners and furnaces as compatible, and the residential HVAC designation gives buyers a clear intended system category. The pleated material and MERV 8 rating identify the filter type, while the four-pack supplies replacements for future changes. Its actual dimensions are 11.75 by 11.75 by 0.75 inches, rather than the nominal title size; measuring the existing filter or slot helps avoid choosing the wrong format.

Skip it if you want six replacements in a single set; the 14x14x1 Amazon Basics MERV 8 comes in a six-pack if that format fits.

This Aerostar fits buyers seeking a four-pack of pleated MERV 8 filters for a residential furnace or air conditioner. Check the actual 11.75-inch dimensions against the required slot size before selecting it.

Listed on Amazon as: Aerostar Air Filter 12x12x1 MERV 8 AC Filter, HVAC, Furnace Filter, 4 Pack

#10

10. Filtrete 16×25 Filter

• Dimensions: 26"L x 16.38"W x 2.5"Th
• Weight: 16 oz
• Material: Polypropylene
• Compatible Devices: Air Conditioner, Furnace

Best for: Higher-rated Filtrete replacement.

Why it ranks #10: This MERV 11 two-pack suits a system requiring the listed 16x25x1 size, but includes fewer filters than the six-pack alternatives.

A MERV 11 rating is the defining feature of this 16x25x1 Filtrete filter, giving buyers a higher stated filtration level than the MERV 5 Filtrete option. The two-filter set suits residential furnaces and air conditioners, with the rating and size helping narrow the choice to a specific HVAC setup.

Filtrete lists this filter for residential HVAC systems and identifies both furnaces and air conditioners as compatible devices, making it an option for either listed appliance when its dimensions match. The MERV 11 rating is paired with the supplied description, “Hard on microparticles. Easy on your HVAC.” Two filters come in the set, so buyers receive a pair of replacements. Confirm that the system uses the stated 16x25x1 size before selecting it.

Skip it if you need six replacements in one set; the 20x25x1 Filtrete MERV 5 comes in a six-filter set if that size fits.

This Filtrete suits residential HVAC owners seeking a MERV 11 filter in the stated 16x25x1 format. It includes two filters, so consider the set size as well as your system’s required dimensions.

Listed on Amazon as: Filtrete 16x25x1 Air Filter, MERV 11, MPR 1000, 2 HVAC Filters