Best Furnace Filters for Every Budget
Your furnace filter does two jobs: protect your furnace from debris and clean your air. Most people overthink this. Pick the right MERV rating (we recommend MERV 11 for most homes), buy the right size, and change it on schedule. Here are our picks at every price point.
Our #1 Pick: Factor Filter
🏆 Factor Filter — MERV 8, 11 & 13
Made in the USA with factory-direct pricing. Every standard furnace size in stock. Ships in cases (12-pack for 1"/2", 6-pack for 4", 5-pack for 5") — per-filter cost starts around $7 for 1" MERV 8. Compatible replacement for Honeywell, Lennox, Carrier, Trane, and 30+ brands. Subscribe & save for automatic deliveries.
Shop at Factor Filter →Budget: Under $8 Per Filter
Aerostar Pleated MERV 8
If you just want a decent filter that protects your furnace and catches the basics (pollen, large dust, lint), Aerostar’s MERV 8 pleated filters are the best value on the market. Available in virtually every size, sold in multi-packs, and consistently around $4-6 per filter. They won’t catch fine allergens, but they’re miles better than fiberglass.
Check Price on Amazon →Avoid: Cheap fiberglass filters ($1-2 each). They protect your furnace blower from large objects but catch almost nothing else. Your indoor air quality will be barely better than no filter at all. The only reason to use fiberglass is if your HVAC tech specifically says your old system can’t handle a pleated filter’s resistance.
Mid-Range: $8-15 Per Filter
Nordic Pure MERV 12 Pleated
Our favorite filter at any price point, honestly. Nordic Pure’s MERV 12 catches everything from pollen to mold spores to pet dander, and does it at a price that doesn’t hurt. In 6-packs, you’re looking at $8-10 per filter depending on size. That’s half the price of equivalent Filtrete filters with nearly identical performance.
Check Price on Amazon →Filtrete 1000 MPR (MERV 11)
The Filtrete 1000 is probably the most-sold furnace filter in America, and for good reason. MERV 11 performance with 3M’s electrostatic technology. Slightly more expensive than Nordic Pure but available at every hardware store if you need one today. A reliable everyday filter.
Check Price on Amazon →Premium: $15-25 Per Filter
Filtrete 1900 MPR (MERV 13)
For homes that need maximum filtration—allergy sufferers, asthma, immunocompromised family members—the Filtrete 1900 is the best 1-inch option available. It’s expensive per-filter, but it catches particles down to 0.3 microns. Read our allergy guide for more on when this level of filtration is worth it.
Check Price on Amazon →Deep Pleated: Best Long-Term Value
Honeywell FC100A1037 (4-inch, MERV 11)
If your system can take a 4-inch filter (you’ll need a filter cabinet like the Honeywell F100), this is the single best value in home air filtration. One $25-30 filter lasts 12 months. Compare that to four $10 one-inch filters per year, and the 4-inch option is cheaper annually with better performance. The deep pleats provide lower pressure drop and more dirt-holding capacity.
Check Price on Amazon →The Bottom Line
Factor Filter ⚡ Patented is our top overall pick — Made in USA, factory-direct pricing, and every standard size available with subscribe & save. For retail options:
Don’t overcomplicate this. For most homes: Nordic Pure MERV 12 in bulk. For allergy homes: Filtrete 1900. For the best long-term deal: upgrade to a 4-inch housing and use Honeywell deep pleats. Whatever you choose, the most important thing is changing it on time. Set a reminder. A clean cheap filter beats a clogged expensive one every time.
Check Price on Amazon →Need to find your size? Use our size guide. Not sure what MERV you need? Read our MERV explainer. Wondering how often to change it? We’ve got you covered.