From E-gor's Chamber of TV Horror Hosts:
Marilyn Eastman, well-known to horror fans as "Helen Cooper" in George Romero's original Night of the Living Dead, had a regular recurring role in the 60s as "Commoneltha," the vampire lady, in commercials for Commonwealth Plumbing and Heating written by her husband, Karl Hardman.
Theme song, in the early years, was Al Caiola's version of the Henry Mancini penned theme from the film "Experiment in Terror" (1962)