Customer reviews from Filterbuy
Filterbuy - 13x21.5x1 MERV 11 Pet & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (4-Pack) - Gold
Average customer rating
4.4
(7,007 Reviews)
Rating breakdown 7,007 reviews
5 Stars
5,174
4 Stars
754
3 Stars
439
2 Stars
245
1 Star
395
Customer Reviews for Filterbuy - 13x21.5x1 MERV 11 Pet & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (4-Pack) - Gold
Customer Rating
5
Great Filters
on February 20, 2026
Posted by: Anonymous
These filters are top quality at a price that is half that as the big box store sells for on a lesser quality. I have gotten them for my neighbors and family and business and wont buy from anywhere else.
Written by a customer while visiting Filterbuy
Customer Rating
5
Great filters and service.
on February 20, 2026
Posted by: Anonymous
I accidentally hit the click here button for I havent received my filters yet. This was an accident. I got my filters.
Written by a customer while visiting Filterbuy
Customer Rating
5
Time & cost
on February 19, 2026
Posted by: Anonymous
Money saving plus Time equals a better life style.Fast and reliable products and service.
Written by a customer while visiting Filterbuy
Customer Rating
2
First 20x20x4 filter Ive ever had not fit
on February 17, 2026
Posted by: Anonymous
I understand it shows actual size. However, for the 15 years Ive been buying filters, this is the first time Ive ever bought the size 20x20x4 and it DOES NOT FIT. But then I have to pay return because the filter size isnt as shown. Many other companies with accurate sizes!
Written by a customer while visiting Filterbuy
Customer Rating
1
Merv 11
on February 17, 2026
Posted by: Anonymous
Didnt think I ordered them as I still ha ve box and half. There great but Im not a store house.
Written by a customer while visiting Filterbuy
Customer Rating
5
Good filters
on February 17, 2026
Posted by: Anonymous
Have to order this size online but I get a good price and stock up
Written by a customer while visiting Filterbuy
Customer Rating
1
The density is too high
on February 17, 2026
Posted by: Anonymous
The core is so dense that i think its unhealthy for the hvac unit
Written by a customer while visiting Filterbuy
Customer Rating
3
It's ok for the price
on February 17, 2026
Posted by: Anonymous
The filter feels too thick like not breathable center .You get what you pay for
Written by a customer while visiting Filterbuy