I know the HD/Industrial ones cost more, but I just like them better and that's not the kind of place I care about saving a few bucks. I expect they're also available in 15 anp, but even though I'd rather have 15 amp faces on the HD devices, I've never seen them anywhere in stock even if they are available. I'm satisfied with the HD/Industrial 20 amp ones. I don't expect anyone to plug in an air conditioner to one of those outlets. I'm only doing my own work.