Customer reviews from Filterbuy
Filterbuy - 9x30x1 MERV 11 Pet & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (1-Pack) - Gold
Average customer rating
4.6
(3,946 Reviews)
Rating breakdown 3,946 reviews
5 Stars
3,132
4 Stars
393
3 Stars
198
2 Stars
89
1 Star
134
Customer Reviews for Filterbuy - 9x30x1 MERV 11 Pet & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (1-Pack) - Gold
Customer Rating
2
Make sure to check the
on April 2, 2026
Posted by: Customer
Make sure to check the inside dimension of your return grill track where the filter would sit. A standard grill, at least in NC is the actual size called out for the filter. In other words, if your return grill size calls for a 14x25 filter, the inside dimension of the grill track is 14"x25". This is the case for other size return grills as well.
A 3M Brand filter is slightly less than the 14"x25 so it fits nice and snug in the filter track. FilterBuy 14x25 is appx. a 1/2" less in both directions so it did not fit snug enough in the grill track and was letting air pass by the sides of the filter and was flopping around in the track space. I ended up putting sticky back foam tape around the grill track to take up space for a better fit and seal. You can purchase a FilterBuy custom size filter to fit snug in the space but they are roughly twice the cost as their standard size filter making them about the same cost as a standard 3M filter. Bottom line is you can save some money with FilterBuy if you buy the standard size filters. Just be prepared to modify your return grill track to make sure the filter fits snug enough to not let air pass by the filter. Some small amount of air passing by the filter is not detrimental, just not as efficient as you should expect for the filter to do its intended job. The only reason I took time to wrote this long review is I am a detail oriented custom home builder and though you might find this info helpful. You decide. :)
A 3M Brand filter is slightly less than the 14"x25 so it fits nice and snug in the filter track. FilterBuy 14x25 is appx. a 1/2" less in both directions so it did not fit snug enough in the grill track and was letting air pass by the sides of the filter and was flopping around in the track space. I ended up putting sticky back foam tape around the grill track to take up space for a better fit and seal. You can purchase a FilterBuy custom size filter to fit snug in the space but they are roughly twice the cost as their standard size filter making them about the same cost as a standard 3M filter. Bottom line is you can save some money with FilterBuy if you buy the standard size filters. Just be prepared to modify your return grill track to make sure the filter fits snug enough to not let air pass by the filter. Some small amount of air passing by the filter is not detrimental, just not as efficient as you should expect for the filter to do its intended job. The only reason I took time to wrote this long review is I am a detail oriented custom home builder and though you might find this info helpful. You decide. :)
Written by a customer while visiting Filterbuy
Customer Rating
1
Too small
on March 31, 2026
Posted by: Customer
Filters are the smallest I have ever bought over 30 years. Shame.
Written by a customer while visiting Filterbuy
Customer Rating
5
Reliable shipment
on March 31, 2026
Posted by: Customer
Reasonable price, super convenient to have filters on hand, ships quickly
Written by a customer while visiting Filterbuy
Customer Rating
5
I very satisfied with my
on March 30, 2026
Posted by: Customer
I very satisfied with my purchases, They were on time and the iitems were perfect with no problem . perfect and no problem.
Written by a customer while visiting Filterbuy
Customer Rating
5
We have used these for
on March 29, 2026
Posted by: Customer
We have used these for 2 years now with great results!!
Written by a customer while visiting Filterbuy
Customer Rating
5
Filterbuy
on March 29, 2026
Posted by: Customer
These filters are outstanding I change it out once a month when I remove them they're black 18x18x 1. I bought this home as they were building it in 2021. thats when I moved from CA to FL I saw your ads and been using them ever since.
Written by a customer while visiting Filterbuy
Customer Rating
5
good filters
on March 29, 2026
Posted by: Customer
These furnace filters seem much better than the last ones we bought. The filters we bought previously had no reinforcement and the cardboard bent when I tried to slide it in place. These filters have 2 types of reinforcement in them and slide in place easily with no bending. We're very pleased with the product.
Written by a customer while visiting Filterbuy
Customer Rating
5
Monthly subscription
on March 28, 2026
Posted by: Customer
I have been on my subscription for about 6 years now, and have even moved to a new home, and started it there. Very happy with the service.
Written by a customer while visiting Filterbuy