In the Buffyverse, vampires cannot enter the residence of a person if not invited. How does this change if the tennant of a residence changes or the tennant  has a new residence. Specifically:

 1. A vampire is invited to the residence 1 of inhabitant A. Inhabitant A moves to residence 2. Is the vampire still considered invited to residence 2 or does the inhabitant have to reinvite him before being able to enter?
 2. A vampire is invited to the residence 1 of inhabitant A. Inhabitant A moves out and a new inhabitant B moves in. Is the vampire still considered invited to the residence 1, even though teh inhabitant has changed?