Customer reviews from Filterbuy
Filterbuy - 21x21x1 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (4-Pack) - Blue
Average customer rating
4.6
(3,408 Reviews)
Rating breakdown 3,408 reviews
5 Stars
2,706
4 Stars
301
3 Stars
184
2 Stars
73
1 Star
144
Customer Reviews for Filterbuy - 21x21x1 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (4-Pack) - Blue
Customer Rating
5
Good quality. Fits the HVAC
on August 14, 2026
Posted by: Customer
Good quality. Fits the HVAC size nicely. Easily disposable.
Written by a customer while visiting Filterbuy
Customer Rating
5
Only Place To Buy Filters
on August 13, 2026
Posted by: Customer
High quality, reasonably priced, American made air filters that ship quickly. Large selection of sizes and efficiency range as well. My go to filter source.
Written by a customer while visiting Filterbuy
Customer Rating
5
Excellent product
on August 12, 2026
Posted by: Customer
Very happy with the product, my house stays dust free and very fresh
Written by a customer while visiting Filterbuy
Customer Rating
5
Filter buy
on August 11, 2026
Posted by: Customer
Of good quality and the right size I needed. Will buy again on a regular basis.
Written by a customer while visiting Filterbuy
Customer Rating
5
All is good
on August 10, 2026
Posted by: Customer
Been doing business with Filterbuy for years and will continue to do so. Excellent product
Written by a customer while visiting Filterbuy
Customer Rating
5
This is best filter company.
on August 9, 2026
Posted by: Customer
This is best filter company. Great for a number of reasons including price, and very great communications about my purchase and recommendations.
Written by a customer while visiting Filterbuy
Customer Rating
1
My 18 by 24 inch filter is short in both dimensions and leaves a gap
on August 8, 2026
Posted by: Customer
My 18 by 24 filter is short in both directions and leaves a gap. I need a true 18x24 filter or a refund. I am very disappointed and have never run into this!
Written by a customer while visiting Filterbuy
Customer Rating
5
R. V. filters
on August 8, 2026
Posted by: Customer
Top quality, American products, competitively priced. Highly recommend
Written by a customer while visiting Filterbuy