A furnace filter improves indoor air quality by trapping particles such as dust, grime, and pet dander that would otherwise clog your furnace or settle in your ductwork. We have curated a list of the 5 best places to buy furnace air filters online. From Custom Filters Direct to Amazon and eBay, these stores provide the best furnace air filters at an affordable rate.

  • Custom Filters Direct

At Custom Filters Direct, you will find a variety of furnace filters. They specialize in heating supplies and appliances, so they know precisely what you require for any furnace or heater imaginable. They have different varieties of air filters, so you can feel assured that they carry your filter type.

  • Amazon

Amazon is truly the A-Z of home products. They sell practically anything, and if they don’t stock a specific item for whatever reason, they frequently provide links to manufacturers that do. The same can be said for furnace filters. If you have an Amazon Prime subscription, you can also anticipate lightning-fast shipping. This establishment may have the most affordable furnace filters.

  • Walmart

Walmart carries a variety of household items, appliances, and furnishings. It is essentially a superstore, and some even have grocery sections. This is fantastic because Walmart is essentially your one-stop shop for all home-related needs, including the purchase of replacement furnace filters.

  • Home Depot

Home Depot is a fantastic place to purchase home goods. In terms of home appliances, they have everything imaginable, including accessories such as furnace filters. Their selection of filters is extensive, but you may need to visit their website to see the complete range.

  • eBay

eBay is a famous online marketplace for a wide variety of items, even though it may seem a bit out of place for furnace filters. You may get a great deal on a bundle of furnace filters, especially if you have an older model or are seeking harder-to-find filters.

The 5 Best Furnace Filters Today

There are different types of air filters in the market today. The stores we have just listed provide a wide range of furnace filters you can purchase with one click. When purchasing furnace filters, take into consideration the material, size and MERV ratings suitable for your home. Pleated filters with MERV ratings between 8-12 are ideal for home use. However, we have curated a list of the 5 best furnace filters today. This list may or may not contain the filter you need as there are, again, many excellent filters.

  • Best For Allergies: Nordic Pure 16x25x1 MERV 12 Pleated AC Furnace Air Filter

This item attracts the majority of airborne contaminants. The filter’s pleated carbon material may help combat strong scents, such as those created by cooking or having pets. The frame of this product is created from recycled beverage board paper, making it environmentally friendly.

Key Features:

  • 16 by 25 inches by 1 inch
  • MERV rating of 12
  • Six-pack

Best For Large Systems: Filtrete 20x25x1 AC Furnace Air Filter

This furnace air filter is designed to surpass fibreglass filters and last up to three months. Up to 64% of airborne particles, including pet dander to pollen, can be captured by the product. Additionally, the package includes straightforward installation instructions for big HVAC systems that require 20 by 25 by 1-inch filters.

Key Features:

  • 20 by 25 by 1 inch
  • MERV rating of 12
  • Two-pack

Best For Small Particles: Aerostar 12x12x1 MERV 13 Pleated Air Filter

This filter may trap mould, pet dander, pollen, dust mites, and germs, among other small particles. This product’s high MERV rating is comparable to that of an N95 mask, purifying the air in your house.

Key Features:

  • 12 by 12 inches by 1 inch
  • MERV rating of 13
  • Six-pack

Best Value: Filtrete 10x20x1 AC Furnace Air Filter

The Filtrete 10x20x1 AC Furnace Air Filter can trap the majority of big airborne particles. It is inexpensive and compatible with the majority of HVAC systems and comes in a six-pack for whole-home protection.

Key Features

  • 10 by 20 inches by 1 inch
  • MERV rating of 5
  • Six-pack

Best For Warm Homes: FilterBuy 16x25x1 Pleated HVAC AC Furnace Air Filter

This product is one of the most durable filters on this list due to its dual-wire backing and ability to endure high temperatures. The FilterBuy 16x25x1 Pleated HVAC AC Furnace Air Filter may last three times longer than other filters due to its resilience. It is also constructed from recycled materials.

Key Features:

  • 16 by 25 inches by 1 inch
  • MERV rating of 8
  • Four-pack


As you can see, there are a plethora of options for finding new furnace filters, both locally and virtually. Most online stores provide subscription services that allow you to have money deducted from your account every month so that you never run out of fresh air filters. It’s entirely up to you whether you want to shop online or in person at any of these establishments.

Are you familiar with purchasing replacement furnace filters online, or do you prefer to shop at a local hardware store? Please share your experience with us! Let us know what you think in the comments section.

Dominic Wong

Dominic Wong, holding a Master’s in Electrical Engineering from Stanford University, has 20 years of experience in the home appliance sector. He joined our website as a freelancer in 20119, sharing his deep understanding of appliance functionality, energy efficiency, and consumer trends. Previously, Dominic worked in appliance design and testing. His background also includes roles in product development and consumer research. An advocate for sustainable technology, he enjoys mountain biking and experimenting with smart home gadgets in his spare time.

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