Air filters for your central heating and a/c come in all shapes and sizes; What you get all depends on what your needs are with your central heating and cooling component as well as your home.
The large difference in air filters other than sizes are the brands of air filters.
Brands love HEPA air filters are known as the easily best around. I have to say that after trying HEPA air filters I have to agree. I mean they are not some miracle air filter love several try to make them out to be, but they are long lasting and they do the job well. They also help you save money on buying air filters in the long run because HEPA air filters can last you longer before having to change them. So you may really pay more for HEPA air filters, but you will save money by paying more for them. This is what makes having HEPA brand air filters so worth it and worth the actual cost. I have been using HEPA brand air filters for a year now and I have to say that I could not be happier with the option that I made in buying the HEPA brand air filters for our central heating and a/c unit. The air quality in our home is also better I have observed since using HEPA brand air filters in our central heating and a/c unit. Compared to other air filters that do not help the air quality, this is just another benefit of HEPA brand air filters for your central heating and a/c!