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The Best 20x25x4-Inch Furnace Filter

Last updated on July 26, 2022
Best 20x25x4-Inch Furnace Filter

Our Review Process

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Our Picks For The Top 20x25x4-Inch Furnace Filters

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Product Overview
Key Takeaway
 Top Pick

Aprilaire Electrostatically Charged 20x25x4-Inch Furnace Filters, 2-Pack

Don't Waste Your Money Seal of Approval


Electrostatically Charged 20x25x4-Inch Furnace Filters, 2-Pack

If you suffer from allergies, you'll want to pick up this 20x25x4-inch furnace filter two-pack. It works to remove common allergens, such as mold spores, dust mites and pet dander. The filter also has a long life of up to 12 months!

Overall Take

Uses Self-Seal TechnologyThis 20x25x4-inch furnace filter is manufactured in the United States and partners with the American Lung Association.

 Runner Up

Honeywell Cardboard 20x25x4-Inch Furnace Filters, 5-Pack


Cardboard 20x25x4-Inch Furnace Filters, 5-Pack

Provide better air quality for your family with this reliable 20x25x4-inch furnace filter. It works to remove even small particles from the air, reducing allergens. Installing the filter is a breeze. Simply look for the arrow to determine the direction of the air flow.

Overall Take

Value MultipackWhen you opt for this 20x25x4-inch furnace filter five-pack, you end up paying the least dollar amount per pack, making it a budget-friendly option.

 We Also Like

Filtrete Airflow Guaranteed 20x25x4-Inch Furnace Filters, 2-Pack


Airflow Guaranteed 20x25x4-Inch Furnace Filters, 2-Pack

This washable and non-electrostatic 20x25x4-inch furnace filter traps pollen, pet dander, smoke, bacteria and viruses. It has a MERV rating of 11 and a 1000 Microparticle Performance Rating. The filter should be changed every 90 days.

Overall Take

Outperforms FiberglassThis furnace filter is highly effective at capturing microparticles.

 Also Great

FilterBuy Standard Residential 20x25x4-Inch Furnace Filters, 2-Pack


Standard Residential 20x25x4-Inch Furnace Filters, 2-Pack

Trap 90% of air particles from dust, pollen and other pollutants. This pleated 20x25x4-inch furnace filter is industrial-grade with dual wire backings. It outperforms standard cardboard designs.

Overall Take

Traps 90% of Particles This air filter for your furnace protects your home from dust, pollen and more.

Buying Guide

Indoor air quality is a hot topic of conversation, and it’s important to do what you can to ensure the air you and your family are breathing is safe and clean. A high-quality HVAC or furnace filter is a good way to ensure you’re removing harmful pollutants and germs out of the air. Furnace filters are designed to remove dust, dirt and debris from the air stream, which also helps to extend the longevity of your furnace’s motor.

There are many varieties of furnace filters, each with advantages and drawbacks. Electrostatic filters are long-lasting and washable. They have an electronic charge and work like a magnet to attract dust particles.  Pleated filters increase the furnace area and can capture more particles in the air. They are deeper than other kinds of filters, so it’s best to see whether your furnace can accommodate them.

HEPA filters are popular for air purifiers and vacuums, but they are not as effective for furnaces because they can create a high amount of air flow resistance. They can often reduce air flow in the house, which affects the heating and cooling process. Activated carbon furnace filters absorb chemicals, fumes and odors from the air. They also remove allergens, harmful chemicals and other air pollutants.

What to Look For

  • Furnace filters come in different sizes, such as 20 by 25 by 4 inches. Be sure to check the size that is required by the make and model of your furnace. You will not be able to substitute different sizes of filters, so it’s vital to get the exact size that is required for your furnace.
  • Changing or washing your furnace filters on a regular basis is key. Otherwise, you furnace filter cannot do its intended job. Each type of filter typically has a recommendation for when it should be changed or cleaned. As a rule of thumb, plan to replace or wash your furnace filter once every three months.
  • In some cases, such as in really hot climates where the HVAC system runs constantly in the summer, you may need to replace or wash your furnace filter more frequently. This also applies to homes which have pets, as their dander and fur can cause furnace filters to need faster replacement.

More to Explore

The MERV, which stands for Minimum Efficiency Reporting Value, is the standard that is used to indicate a furnace filter’s efficiency. The MERV scale identifies the size of particles that the filter can eliminate from the air. For example, a filter with MERV 6 can filter out dust, lint and pollen while a filter with MERV 6-11 can filter out other things like smog and large respiratory droplets. If you want to filter out viruses and bacteria, you will need a filter rated MERV 6-13. For specialized setting such as hospitals and clean rooms, you need to use filters with MERV 16 or higher.

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