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
"Filter doing very well. Still on 1st one and helps in running ac. Thank you we apprecite it."
Kurt S.
Verified Buyer
"They are great"
Justin S.
Verified Buyer
"Quick service with delivery straight to my door. Great price will buy again."
Matt W.
Verified Buyer
"Great service"
steven d.
Verified Buyer
"Great filters at a good price."
Martha N.
Verified Buyer
"Filter king is a FANTASTIC, reputable company. AC filters are great. I will continue to purchase filters from Filter King always."
Home Z.
Verified Buyer
"Thanks"
Jim M.
Verified Buyer
"Filters on time and as ordered"
Bruce M.
Verified Buyer
"Our HVAC system needs a very specific filter — one you cannot buy online or at any local hardware store, and trust me, I’ve tried. Every “compatible” option left gaps or buckled under the system’s pressure. Then I stumbled across Filter King. At first, I was frustrated that I had to order in bulk for a product I wasn’t even sure would fit. But OMG… the filters arrived and THEY ARE PERFECT. Absolutely perfect. Now I’m thrilled I had to buy in bulk. It genuinely feels like we hit the lottery."
Niessa N.
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.
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