Customer reviews from Filterbuy
Filterbuy - 21x22x4 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (4-Pack) - Blue
Average customer rating
4.1
(1,155 Reviews)
Rating breakdown 1,155 reviews
5 Stars
716
4 Stars
109
3 Stars
127
2 Stars
88
1 Star
115
Customer Reviews for Filterbuy - 21x22x4 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (4-Pack) - Blue
Customer Rating
5
Great buy and performance
on July 25, 2026
Posted by: Customer
I have used Filterbuy for several years and they continue to be a great buy for the truly good performance. I prefer the MERV 13 for filtering out my pets and keeping microbes in check.
Written by a customer while visiting Filterbuy
Customer Rating
1
It comes with way toooo
on July 18, 2026
Posted by: Customer
It comes with way toooo many emails l communications
Written by a customer while visiting Filterbuy
Customer Rating
5
love it dont have to
on July 16, 2026
Posted by: Customer
love it dont have to change filters but 1 time every 6 months
Written by a customer while visiting Filterbuy
Customer Rating
5
I ordered them for myself
on July 8, 2026
Posted by: Customer
I ordered them for myself and my daughter, and they come very quick and fit perfectly.
Written by a customer while visiting Filterbuy
Customer Rating
5
Great filters at a reasonable price!
on July 7, 2026
Posted by: Customer
I'm very pleased with the replacement filters for my HVAC system. I ordered the same ones last time and they do not disappoint. Also, they arrive MUCH sooner than expected. I saved more by ordering in bulk.
Written by a customer while visiting Filterbuy
Customer Rating
3
20x20x4 filter is only 3. 5 inches
on July 5, 2026
Posted by: Customer
These filters are a full half inch less deep than advertised, and almost an inch less than the 3M filters I have been using. Pretty disappointing.
Written by a customer while visiting Filterbuy
Customer Rating
5
Great product, great service
on July 2, 2026
Posted by: Customer
Love the option to set up recurring orders (and modify as needed). Would prefer a lighter color (easier to see when they are getting grungy) but overall great product.
Written by a customer while visiting Filterbuy
Customer Rating
5
I am overstocked. DO NOT
on June 27, 2026
Posted by: Customer
I am overstocked. DO NOT SEND FILTERS UNTIL FURTHER NOTICE
Written by a customer while visiting Filterbuy