The house of Dr. Gerhart appears in House Calls. It is possessed by the music Gerhart used to bring his house to life just so he could have a friend. Gerhart refers to his house as a she, meaning his house is a female, which can be concluded as the house makes woman-like groans. The house is very jealous of anyone who comes between her and her owner, Gerhart. Which is why it became immediately jealous of courage, Muriel and Eustace. And then attacked their farmhouse by throwing bricks and wood at their home. The house is later calmed down when Courage and Gerhart decide to redecorate it by painting it pink and cleaning the insides. After that, the house became good and peaceful rather than jealous and cruel.