User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-10487081-20130313232701/@comment-3146930-20130314000342

Or maybe it is just a coincidence and you are reading too much into it. No offense, but it just doesn't really seem like Rick Riordan would include that one line in The Last Olympian with the thought "I'm going to write this line in here so that when I start The Heroes of Olympus series, I can have the third book in that series called The House of Hades as well, even if Hades is referring to his family in The Last Olympian and the House of Hades is just a temple to Hades in The House of Hades" in mind.

It could just be as simple as a minor double meaning, as the House of Hades is an actual place and certain members of the House of Hades (namely Nico) will help get them there. Like I said, I think it is just a coincidence or maybe Rick Riordan just liked the sound of it in The Last Olympian and decided to use that for the name of the temple.