Customer reviews from Filterbuy
Filterbuy - 21x21x4 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 - 21x21x4 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (4-Pack) - Blue
Customer Rating
3
Not too many pleats
on June 26, 2026
Posted by: Customer
This filter that I purchased to use in my Carrier Infinity HVAC system does not have many pleats, maybe 10-12. The original Carrier OEM filter has about 100 pleats which I assume would catch more dust and debris. The price of the Filterbuy unit is about 1/3 the cost so I'll see how well it performs before I make a decision to buying one again.
Written by a customer while visiting Filterbuy
Customer Rating
5
Do not send any more
on June 17, 2026
Posted by: Customer
Do not send any more filters. We will call when we need them
Written by a customer while visiting Filterbuy
Customer Rating
5
Great service and products
on June 17, 2026
Posted by: Customer
Got first time furnace filters fast and efficiently
Written by a customer while visiting Filterbuy
Customer Rating
5
Simple
on June 17, 2026
Posted by: Customer
Great filters. Best of all I don’t have to think about it. They automatically come in the mail and is a great reminder to replace the filters on a regular basis.
Written by a customer while visiting Filterbuy
Customer Rating
5
4 in x 20 x 20 filters merv 13
on June 17, 2026
Posted by: Customer
Great fits the slot inlike the 4in i had bought earlier from another source
Written by a customer while visiting Filterbuy
Customer Rating
5
Not sure
on June 8, 2026
Posted by: Customer
I just put it in the furnace. I’ll let you know when I change it in 3 months
Written by a customer while visiting Filterbuy
Customer Rating
5
I purchased 4 of these
on June 8, 2026
Posted by: Customer
I purchased 4 of these last year but didn't create an acct. I didn't pay close attention but I thought the pleats were evenly spaced. These, that I purchased this year are not. The one that measured range from a1/2" to 1-1/2'. and they are placed in the frame crooked. I have an old flip phone and cannot provide you with pictures nor video. otherwise, a GREAT filter!!
Written by a customer while visiting Filterbuy
Customer Rating
5
Great Price & Quality
on May 28, 2026
Posted by: Customer
Our HVAC company confirmed that Filterbuy is their source. The prior home had electronic filters to wash in the driveway.
Much cleaner!
Much cleaner!
Written by a customer while visiting Filterbuy