Lennox air filters
Shop Filter King replacement filters for Lennox systems. Fast, free shipping directly to your door.
Guaranteed to fit
Compatible with a wide range of Lennox systems
MERV 8, 11, 13 & Carbon
High-performance filtration for cleaner, healthier air
Fast, free shipping
Fast delivery from 4 fulfillment centers across the USA
Easy to return / exchange
Not the right fit? Return or exchange your order within 30 days.
Choose your Lennox filter
Can’t find your air filter size?
Order a made-to-measure air filter that fits perfectly and keeps your air clean.
10,000+ satisfied customers
4.6 stars, 5243 reviews
4.5 stars, 4314 reviews
"I am a new customer and so happy I found Filter King. Their customer service is truly outstanding."
Christine D.
Verified Buyer
"Easy"
Deborah W.
Verified Buyer
"Always a pleasure to work with you"
Ed B.
Verified Buyer
"First set was off, second set was sent without even asking!!!"
Jarrod M.
Verified Buyer
"Great company great product. Great customer service. The sizes are empirically perfect and fit very well. The customer service is exceptional and this company actually returns your calls. Im a big fan. Very glad I found these guys."
Brian C.
Verified Buyer
"arrived undamaged & on time"
christine g.
Verified Buyer
"Easy to find sizes"
Mark M.
Verified Buyer
"These fit perfectly, it’s so nice to get a custom size."
Rebecca S.
Verified Buyer
"Great prices, good quality."
Kenneth D.
Verified Buyer
"When I accidently ordered the wrong size... I called & customer service fixed my error with correct size. Shipping was prompt!!! Very pleased with Filter King!! 😊"
Sarah P.
Verified Buyer
Filter King air filters for Lennox
Filter King air filters are compatible with Lennox HVAC systems and work as direct replacements for the original filters made for these units — at a fraction of the price. Each filter is MERV-rated and built to the same dimensional specs, so you get reliable, high-quality filtration without the premium cost.
guaranteed compatibility with