The word "Dump" has a negative connotation. The word inflicts negative emotions and gives the reader an image of a house that is busted up and seems almost unable to live in. An example of what that might look like is above.
The word "House" has a neutral connotation. The word provokes emotions neither positive or negative. The word is too general to really give any specific emotion. A house could really look like anything. An example is above.
The word "Mansion" has a positive connotation. The word provides positive emotions and gives the reader an image of a large house, usually owned by a very rich person. An example is above