When shopping for air filters for our central heating and air conditioning, the most important thing is finding the right brand that is right for your Heating, Ventilation, and A/C component and home. After I tried a ton of different brands of air filters the one that I decided to go with was the HEPA brand air filters. The reason I chose HEPA air filters was because they ended up being the ones that worked best and also they lasted the longest. I did not have to change our air filters for a few months at a time. While dealing with other brand air filters for our central heating and air conditioning, I constantly had to change them weekly. And they ended up costing me more in the long run because I had to keep going out and buying more and more. With HEPA air filters in the course of a year I have to buy about half the amount of air filters than I was buying with the other brands… Not to mention, with HEPA air filters it also helps keep the air quality in our apartment much more scrub than it would with official air filters. It is not like having a whole apartment UV air purifier, but it comes up to a close minute in line. I do have a portable air purification plan that I use from time to time to scrub the indoor air conditions, but these HEPA air filters kind of do it on their own.