It's not super easy to be in the filters subscription business. People have odd size filters (I'm one of them, it's 1" shorter than the standard size), so it's

It's not super easy to be in the filters subscription business. People have odd size filters (I'm one of them, it's 1" shorter than the standard size), so it's a bit labor intensive. This is the sort of thing you should really be able to subscribe to when you get your furnace.