What MERV rating are Discounted Furnace Filters products?

All Discounted Furnace Filters products are rated MERV 11. MERV 11 captures airborne contaminants as small as 0.3 microns — including dust, pollen, pet dander, mold spores, and smoke particles. This is the optimal rating for most residential homes, balancing superior filtration with proper airflow.

Are your furnace filters made in North America?

Yes. All our filters are manufactured in North America without toxic glues or chemicals, using hydrophobic polyolefin fibers that resist moisture and mold. Stored in climate-controlled, mold-free facilities from manufacture to your door.

Do you offer free shipping across the United States?

Yes — free shipping on every order to every US state and Canada. We ship from two warehouse locations: Buffalo, New York and Carrollton, Texas. Most customers in the eastern US, southern states, and central US receive their filters within 1–3 business days via ground shipping.

How often should I change my furnace filter?

For MERV 11 filters, replace every 3–6 months. Homes with pets or allergy sufferers: every 3 months. Low-occupancy homes with no pets: up to 6 months. A dirty filter increases energy bills, reduces airflow, and allows contaminants to bypass filtration.

Will your filters fit my furnace? Are they OEM equivalent?

Yes. Our filters are OEM-equivalent replacements meeting or exceeding specifications for Honeywell, Five Seasons, Clean Comfort, Lennox, GeneralAire, and Aerostar systems. Every product listing includes the specific OEM part numbers it replaces and a full compatibility list.

What is the difference between 1 inch, 4 inch, and 5 inch furnace filters?

Filter thickness determines media surface area and lifespan. 1 inch filters are most common — replace every 1–3 months. 4 inch filters last 6+ months with better dust-holding capacity. 5 inch filters offer the highest capacity — our 5 inch filters have 24 deep pleats and 2–4 times the dust-holding capacity of standard filters. Your furnace cabinet determines which size fits.

Do you offer a furnace filter subscription?

Yes. Our filter subscription delivers your chosen MERV 11 filters automatically every 3 or 6 months — free shipping every delivery. Never run out or forget to reorder. Pause or cancel any time with no penalty.

How do I find the right furnace filter size?

Check the label on your existing filter — you will see three numbers like 16x25x5 (width x height x depth in inches). That is your nominal size. Order the matching size from our site. Each product listing also includes the actual dimensions (slightly smaller than nominal) and OEM part number cross-references.

Why buy from Discounted Furnace Filters instead of Amazon or a big box store?

Three reasons: quality, price, and speed. Our MERV 11 North American manufactured filters outperform most big-box alternatives. Our direct-to-consumer pricing removes the retail markup. And free 1–3 day shipping from two US warehouses means faster delivery than many Amazon fulfillment options — with no membership required.

What makes your filters different from cheap online alternatives?

North American manufacturing, no toxic glues or chemicals, hydrophobic mold-resistant polyolefin fibers, 2–4 times the dust-holding capacity of standard filters, climate-controlled mold-free storage, and 35+ years of professional HVAC experience behind every product. We do not sell cheap overseas imports.

Furnace Filters | Furnace Air Filter Replacement | HVAC Filters

Quality Furnace Filters For Less.

We offer a wide range of replacement furnace filters for major brands like Honeywell, Five Seasons, Clean Comfort, Lennox, GeneralAire, and more!

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Furnace Filters

M0-1056 (16 x 20 x 5) – Value Pack of 3

Sale

M0-1056 (16 x 20 x 5) – Value Pack of 3

Vendor:
Electro Air Five Seasons

Regular price $167.00 CAD

Regular price ~~$211.00 CAD~~ Sale price $167.00 CAD
Unit price per

Sale
M1-1056 (16 x 25 x 5) – Value Pack of 3

Sale

M1-1056 (16 x 25 x 5) – Value Pack of 3

Vendor:
Electro Air Five Seasons

Regular price $167.00 CAD

Regular price ~~$211.00 CAD~~ Sale price $167.00 CAD
Unit price per

Sale
M2-1056 (20 x 20 x 5) – Value Pack of 3

Sale

M2-1056 (20 x 20 x 5) – Value Pack of 3

Vendor:
Electro Air Five Seasons

Regular price $167.00 CAD

Regular price ~~$211.00 CAD~~ Sale price $167.00 CAD
Unit price per

Sale
M8-1056 (20 x 25 x 5) – Value Pack of 3

Sale

M8-1056 (20 x 25 x 5) – Value Pack of 3

Vendor:
Electro Air Five Seasons

Regular price $167.00 CAD

Regular price ~~$211.00 CAD~~ Sale price $167.00 CAD
Unit price per

Sale
MFH-1620-4 (16 x 20 x 4) – Value Pack of 3

Sale

MFH-1620-4 (16 x 20 x 4) – Value Pack of 3

Vendor:
Electro Air Five Seasons

Regular price $153.00 CAD

Regular price ~~$190.00 CAD~~ Sale price $153.00 CAD
Unit price per

Sale
MFH-1625-4 (16 x 25 x 4) – Value Pack of 3

Sale

MFH-1625-4 (16 x 25 x 4) – Value Pack of 3

Vendor:
Electro Air Five Seasons

Regular price $153.00 CAD

Regular price ~~$190.00 CAD~~ Sale price $153.00 CAD
Unit price per

Sale