They are using 4" media filters - these are good filters and are a big improvement over the older style 1" filters. They cost more but last much longer - typically a year. Local stores don't carry them because most homes don't have them - most likely not worth the shelf space for a low demand product. I have been mail ordering 4" media filters for 10 years and will probably still be mail ordering them 10 years from now.
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Originally Posted by cquick
Yes,this is how we order ours. Seems so odd to me that the a/c units installed by the builders have filters that cannot be purchased at a local store.
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