Air-conditioner-filters - Free Shipping & Returns

Select your filter’s thickness:

1” or 2”

3” or more

Why finding the right thickness of filter is important.

Ensuring that your filter fits properly in your HVAC system means making sure that you have not only the right length and width, but also thickness of your filter. Most standard air filters are 1 - 2 inches in thickness. Whereas media filters are typically 3 to 5 inches in thickness. The best way to measure your air filter size is to get out the measuring tape and measure it directly.

Regularly replacing your air filter will help improve the efficiency and longevity of your furnace.

A dirty filter in your HVAC system will raise your energy bills. A dirty filter restricts the air flow into your HVAC systems air handler, causing it to work harder to cool or heat your home.

A dirty clogged filter can restrict HVAC airflow and potentially cause problems with the system. They also cease to filter allergens and other particulates out of your air.

Dirty, unchanged filters can make your HVAC system fail completely. Repairing a broken HVAC system can end up costing you a pretty penny.

...or find your filter by brand

  • Aprilaire Air Filters
  • 3M Filtrete Air Filters
  • Trion Air Bear Air Filters
  • American Standard Air Filters
  • Carrier Air Filters
  • Honeywell Filters
  • Bryant Air Filters
  • Goodman Air Filters
  • Trane Air Filters
  • GeneralAire Air Filters
  • Lennox Air Filters
  • Space-Gard Air Filters
  • Skuttle Media Filters
  • White Rodgers Air Filters
  • Dynamic Air Cleaner Refills

The air in your home is up to five times more polluted than the outside air. Impurities such as dirt and dust, pollen and pet dander, mold and bacteria, and smoke and smog build up in your air conditioner and ventilation system, causing allergies, asthma triggers, and other respiratory problems. Remedy these problems by replacing your air conditioner filters and breathe easy.

A good AC filter uses special, densely woven, electrostatically charged material to capture pollutants in the air before they pass into your air conditioner or HVAC unit. The filter media is arranged in pleats to increase the surface area, providing more filtration per filter. Over time, as the AC air filter media gathers more pollutants, it becomes clogged, making it more difficult for the air conditioner to pull air through, making it work harder to cool your home. Because of this, the air conditioner filters should be changed at least every three months to avoid extra strain on your AC unit and reduce your energy to costs. If you live in an environment where you are doing remodeling, if it's allergy season, or if you have pets, you should consider changing the filter more often.

DiscountFilters.com carries the best selection of air conditioner filters at the best prices on the web. We have OEM AC filter models from the top manufacturers, including Aprilaire, Filtrete, Lennox, Trane, Honeywell, American Standard, Carrier, and Air Bear. We also carry a variety of aftermarket models with a broad selection of sizes and MERV ratings, including custom, hard-to-find AC air filter sizes. At DiscountFilters.com, we offer free shipping and returns on all orders, and a one-year satisfaction guarantee on all of our products. 

We Love Filters

Save Your Furnace Tip #2:

When selecting an air filter, take time to measure the exact dimensions and compare them with the exact dimensions listed on our site.