Customer reviews from Filterbuy
Filterbuy - 18x21x1 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (12-Pack) - Blue
Average customer rating
4.6
(3,408 Reviews)
Rating breakdown 3,408 reviews
5 Stars
2,706
4 Stars
301
3 Stars
184
2 Stars
73
1 Star
144
Customer Reviews for Filterbuy - 18x21x1 MERV 13 Smoke & Allergy Defense, Electrostatic Pleated HVAC AC Furnace Air Filters Replacement (12-Pack) - Blue
Customer Rating
4
Just a touch smaller than the opening
on August 1, 2026
Posted by: Customer
Filter labeled as correct size , it’s a little smaller than the opening which causes it to whistle or fall out of place. When unit comes on you can hear filter suck back into a position
Written by a customer while visiting Filterbuy
Customer Rating
5
Merv 13 Pleated Air Filter
on July 31, 2026
Posted by: Customer
This was not my first purchase of this filter. I’m a repeat customer because I like the performance of the filter.
Written by a customer while visiting Filterbuy
Customer Rating
5
The only place to get filters
on July 31, 2026
Posted by: Customer
Shipping and packaging great, fit the furnace perfect. Great cost value
Written by a customer while visiting Filterbuy
Customer Rating
5
Great fitting filters
on July 31, 2026
Posted by: Customer
Fits perfectly into the furnace where other filter brands have fought to fully go in. The price of these filters are excellent as well
Written by a customer while visiting Filterbuy
Customer Rating
5
These are very high quality
on July 30, 2026
Posted by: Customer
These are very high quality filters made even better having them sent to my house .
Written by a customer while visiting Filterbuy
Customer Rating
3
Not sure
on July 26, 2026
Posted by: Customer
First time not been but two weeks. But my concern is the whistle noise I notice on return. I purchased several and I will try the next one to see if it continues
Written by a customer while visiting Filterbuy
Customer Rating
5
The best filters.
on July 25, 2026
Posted by: Customer
These filters are well made,very dependable and the price is right. They fit much better than higher priced filters.
Written by a customer while visiting Filterbuy
Customer Rating
5
Great company
on July 23, 2026
Posted by: Customer
I called to get a little advice and I must say they are so helpful and professional. They have a good price and ship very fast. I intend to shop here as long as I need filters.
Written by a customer while visiting Filterbuy