Air-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

Get Better Indoor Air Quality

Allergies, pets, odors and smoking all can greatly affect the quality of your indoor air. DiscountFilters.com offers many different types of discount air filters to help you breathe better air inside your home based on your specific needs. 

Good: The most basic air filter a homeowner will need is a MERV 8. A MERV 8 filter offers excellent air filtration for their home. A MERV 8 air filter would be good for a family that doesn't smoke, doesn't have pets, and doesn't have bad allergies. 

Better: People with pets and/or light allergies, would greatly benefit from a more advanced filtration level called a MERV 11. A MERV 11 filter reduces pet dander, dust, pollen and other particles that are present in your home. 

Best: A MERV 13 air filter however will capture even smaller dust particles, dirt, pollen, mold spores, pet dander and more from your home's air. A MERV 13 air filter is great for people with regular allergies and who own multiple pets. The MERV 13 filter is typically more expensive and will also put more strain on your HVAC system, however the high quality filtration you will get will be well worth it. 


We carry discount air filters in 1-2 inch standard sizes, and 3-5 inch media sizes. Our air filters are great and work well in HVAC systems, furnace and air conditioner systems. If you are looking for a custom size air filter you can request that we make a special size for you. As always, we offer free shipping and returns on all of our discount filters. 


We Love Filters

Save Your Furnace Tip #5:

Make sure your filter fits snug in its slot or cabinet. Gaps that allow air to bypass the filter can significantly reduce its effectiveness.