Customer reviews from Filterbuy
Filterbuy - 21x21x1 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (1-Pack) - Blue
Average customer rating
4.6
(3,422 Reviews)
Rating breakdown 3,422 reviews
5 Stars
2,716
4 Stars
302
3 Stars
185
2 Stars
73
1 Star
146
Customer Reviews for Filterbuy - 21x21x1 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (1-Pack) - Blue
Customer Rating
5
Great way to buy filters!
on October 8, 2026
Posted by: Customer
I was pleased to find an American made source for filters that saves me money and delivers them right to my front door fast. The filters are as good or better quality than any I’ve used in the past. I highly recommend that you give Filterbuy a try.
Written by a customer while visiting Filterbuy
Customer Rating
1
They are sized small. They
on October 7, 2026
Posted by: Customer
They are sized small. They are 17 1/2”x 23 3/8”. They get sucked up
Written by a customer while visiting Filterbuy
Customer Rating
5
Was told 13 is not
on October 7, 2026
Posted by: Customer
Was told 13 is not good for furnace fan and should not be used
Written by a customer while visiting Filterbuy
Customer Rating
4
Filter is fine. Nothing special
on October 5, 2026
Posted by: Customer
Filter is fine. Nothing special but the price is hard to beat.
The emails after the purchase though! My lord. Talk about being spammed!
The emails after the purchase though! My lord. Talk about being spammed!
Written by a customer while visiting Filterbuy
Customer Rating
5
Clean home
on October 4, 2026
Posted by: Customer
I feel like I immediately felt the air in my home cleaner. Our furnace has a built-in air purifier and my home was less dustier and it didn't have the usual after cooking smell that lingers for a day or so.
Written by a customer while visiting Filterbuy
Customer Rating
5
Epic
on October 4, 2026
Posted by: Customer
Been with these filters since 2001 they have have been amazing.
Written by a customer while visiting Filterbuy
Customer Rating
5
So much better than the hardware store
on October 1, 2026
Posted by: Customer
Very happy with the quality, service and timely manner. Price can’t be beat. I’ll never go back to the old way of buying filters
Written by a customer while visiting Filterbuy
Customer Rating
5
Good folters
on September 30, 2026
Posted by: Customer
I have been buying these got s few years now, I am totally satisfied with the quality of these filters and the reasonable price
Written by a customer while visiting Filterbuy