I am 26, and I was thinking Mr. Boogety. Though it is not a vampire movie. It's a poltergeist movie and he is green and i remember something about a vaccum. It has the uncle from My girl in it. It was a disney movie that used to scare me and I would hide behind our couch. They made a sequal called bride of boogedy or something. Here are some photos from it:
Here is a good summary, I do think this is the movie you are thinking about:
"When the Davis family moves to Lucifer Falls, they quickly learn that their less-than-humble abode harbors a ghost. Several hundred years earlier, Mr. Boogedy, as he came to be known, sold his soul for a magic cloak, that he'd hoped would win him the affection of widow Marion. When his scheme failed, he kidnapped Marion's son, Johnathon, returned to his home, and accidently blew it up. New he and Jonathon are trappend in the home that was built on the site, and it's up to the Davis' to remove his magic cloak to banish him forever and return Jonathon to Marion."
