I live in Michigan and my 2 furnaces run constantly. It is extremely important to me that my family breathes clean, dust/allergen free air. Plus, it makes house cleaning so much easier. The filters are high quality, easy to use and I only have to change them once a year. I wouldn't buy any other brand. Filtrete whole house filters work!

I am happy with the performance of this filter. However although it slides into the box easily, it is hard to remove. It would be nice to have cutouts in the cardboard for finger holds. It is also hard to remove; it is almost as if it expands. I am afraid I will damage the wires in my furnace as I remove it. It comes out in a few pieces.

I bought the 4" filters for the first time in the fall. It is worth the price difference. My unit is up in the attic so getting up in the attic is a pain. Now I only need to change the filter every 3 months and it really helps with the dust in the air.. The air quality in our home has really improved.

I have been using the basic flat filters for several years. I always thought that as long as I changed or cleaned them every month they were just as good as the more expensive "Allergen Reduction" filters. Boy was I wrong. I decided to try a Filtrete Allergen Reduction filter because my eyes were constantly irritated and itchy, and on wet humid days I could smell that "wet dog" smell more often. I've been using the model 1200 filter for just over two months, and my eyes are not itchy and there has been NO wet dog smell. I have been very happy with this purchase; just wish I had tried them many years ago.

I've been installing this filter in our furnace since it became available. It not only produced a cleaner home interior (our house was built in 1913) but also keeps the motor/fan and its enclosure cleaner thereby saving major and expensive mechanical furnace repairs/replacements!

[This review was collected as part of a promotion.] I love everything about this filter. It does an amazing job, it's easy to install, it comes in the hard-to-find size that I need, and the optional email reminders that it's time to change the filter make life easy and healthy.

Bought this a month ago after having my unit replaced. I was suffering with severe allergies due to the ductwork and unit being replaced by a very sloppy company, so I decided to give it a shot (it had its work cut out for it) I am replacing it today. Usually lasts a lot longer but my home was contaminated severely due to the negligence of our ac repair company!

[This review was collected as part of a promotion.] My nephew stays with me from time to time. He has asthma, which seems to act up on high pollen days. We can have the windows up with the air off and he would need breathing treatments. A couple of minutes with the windows shut and the air being on, lil man is back to normal.

I've been using this type filter almost 3 months, and I've got to tell you that it's a great improvement over reusable filters that I was using. You can see all of the particles it collected...yes, it is DIRTY! I couldn't really see the dirt on the washable ones. I've noticed that there is less dust collecting in the house' big plus! Haven't noticed reduction of airflow nor higher energy bills. I'll continue using this filter...a little expensive to me- but we'll worth it!

This is the best filter for keeping the animal allergens under control. I put in a new one in the furnace yesterday before relatives with dog allergies came over and they had no problems the entire evening. So great! Better, too, for us non allergy people to not be breathing in all those minute particles.