I heard this very recently, and I don't think it's true at all. I haven't seen any Scripture provided with it.
The background as to why I asked the question is this: I noticed a post about something that may have involved a demon by a friend on Facebook. I said something regarding rebuking it in Jesus' name or just praising God, and her sister said that a demon couldn't be in the house because the house was blessed a while ago.
Where does that come from? Is there ANY truth to it? I mean, I know demons are pretty much everywhere, but is there any Scriptural basis for that? (The friend who posted is Christian, and I'm pretty sure her sister is too.)