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
5
Great Price!!
on October 6, 2025
Posted by: Anonymous
GREAT price and work just as good as more expensive filters. I actually think these are better. My house isn't as dusty as it used to be.
Written by a customer while visiting Filterbuy
Customer Rating
5
Perfect fit
on September 27, 2025
Posted by: Anonymous
The fit and size were spot on. Just what i needed.
Written by a customer while visiting Filterbuy
Customer Rating
5
Merv 13 Pleated air Filter
on September 20, 2025
Posted by: Anonymous
Have been using this product for 2 plus years. Upon upgrading to the Merv 13 filtration, I noticed some dustballs collecting on the filters after first couple of filter changes. Now, no dustballs. These filters use "nominal" sizing. I had to add shims to filter box in order to prevent air bypass. I use the 4" deep filters and change every 4 months. I'm very satisfied with performance of these filters and will continue to use.
Written by a customer while visiting Filterbuy
Customer Rating
5
Just whats needed
on September 6, 2025
Posted by: Anonymous
This filter saves us the hassle of too frequent cleaning the house, being in a construction zone.
Written by a customer while visiting Filterbuy
Customer Rating
5
Excellent company to deal with
on September 5, 2025
Posted by: Anonymous
[This review was collected as part of a promotion.] I've dealt with Filterbuy 3 times and they have always had great service and products. The filters are as good or better than name brands and you can find any size you need. They are also made in USA with an excellent price and shipped free. I definitely recommend this company.
Written by a customer while visiting Filterbuy
Customer Rating
5
4 filter
on September 3, 2025
Posted by: Lynda G.
Hoping these filters help to cut down on a fine white dust that is everywhere in the house! The company I deal with only changes filters once a year. They have also changed filter style. Wish me luck. .
Written by a customer while visiting Filterbuy
Customer Rating
5
Steven Curtis Valadez
on September 1, 2025
Posted by: Steven V.
For years my hvac company furnished filters. With this purchase I saved money and upgraded my filters. I should have been purchasing these filters yrs ago
Written by a customer while visiting Filterbuy
Customer Rating
5
Excellent Filters
on September 1, 2025
Posted by: Anonymous
I couldn't ask for anything better and a great price.
Written by a customer while visiting Filterbuy