Customer reviews from Filterbuy
Filterbuy - 21x21x4 MERV 11 Pet & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (12-Pack) - Gold
Average customer rating
4
(1,144 Reviews)
Rating breakdown 1,144 reviews
5 Stars
660
4 Stars
148
3 Stars
119
2 Stars
91
1 Star
126
Customer Reviews for Filterbuy - 21x21x4 MERV 11 Pet & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (12-Pack) - Gold
Customer Rating
4
To small
on August 26, 2025
Posted by: Anonymous
The filters are undersized so that they fit all filter boxes. This leaves room for air to go around the filter in my box.
Written by a customer while visiting Filterbuy
Customer Rating
5
Great choice!
on August 26, 2025
Posted by: Anonymous
This filter from Filter buy is much better than the skinny filter that I used to use!
Written by a customer while visiting Filterbuy
Customer Rating
5
I ordered the filters and
on August 26, 2025
Posted by: Anonymous
I ordered the filters and was super surprised to receive them the next day! Amazing service! I will definitely use FilterBuy again and tell my friends about this great company! Thank you! Dave Reese
Written by a customer while visiting Filterbuy
Customer Rating
3
While the dimensions were correct,
on August 25, 2025
Posted by: Anonymous
While the dimensions were correct, it didn't fit the Carrier furnace.
Written by a customer while visiting Filterbuy
Customer Rating
5
HVAC FILTERS
on August 25, 2025
Posted by: Anonymous
Best company for filters out there. Fast efficient and good quality product.
Written by a customer while visiting Filterbuy
Customer Rating
2
Filter is too small
on August 15, 2025
Posted by: Craig J.
I ordered the same size as the replaced filter, but these filters were 0. 5 inches or so smaller on every dimension. Air will easily leak around the filter. Sorry, but I will not buy again.
Written by a customer while visiting Filterbuy
Customer Rating
4
My bad
on August 9, 2025
Posted by: Jeff V.
Great price, great service. Ordered wrong size, should have ordered 5" width. Will use up and buy correct ones.
Written by a customer while visiting Filterbuy
Customer Rating
5
Just installed the filter but
on August 7, 2025
Posted by: Mitchell Z.
Just installed the filter but so far its working great. And the price is fair
Written by a customer while visiting Filterbuy