Armstrong air filters
Shop Filter King replacement filters for Armstrong systems. Made in the USA with fast, free shipping directly to your door.
Guaranteed to fit
Compatible with a wide range of Armstrong 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 Armstrong 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
"Great experience with awesome service and products."
Phillip O.
Verified Buyer
"Ready to change filter for the year."
Frances S.
Verified Buyer
"Great customer service."
Scott S.
Verified Buyer
"Fit my furnace better than other brands purchased previously. I plan or purchasing future filters from here."
William L.
Verified Buyer
"It's the correct size and I really appreciate it!"
Kathleen H.
Verified Buyer
"Very timely delivery, extremely satisfied with the filter."
Adaeze I.
Verified Buyer
"Great Filters at a Fantastic Price."
Harry B.
Verified Buyer
"Great customer service and great filters"
Bruce K.
Verified Buyer
"This the first time I have order from this company. I am very happy with the service. For years I couldn't get the right filter size to fit my HAVC. The company specially made the right size and it fits perfectly. The delivery was on time and quick. The price is reasonable. I will order with this company down the road again."
C. G.
Verified Buyer
Filter King air filters for Armstrong
Filter King air filters are compatible with Armstrong 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