The feeling of the Buchanan household in The Great Gatsby is generally tense and unhappy. Neither Tom nor Daisy seem very happy with one another.
Daisy says, speaking about Jordan Baker spending time with the Buchanans, that, "'the home influence will be very good for her.' Daisy and Tom looked at each other for a moment in silence." This moment of silence after Daisy's comment is a strained one that illustrates the tension in their home in general.
After Nick leaves their house, he doesn't have a good feeling about their household, and writes,
"It seemed to me that the thing for Daisy to do was to rush out of the house, child in arms-but apparently there were no such intentions in her head."
Nick was very aware of the tension between husband and wife, and was surprised to learn of "Tom's woman," which of course is a large factor in the conflict and tension between Daisy and Tom. Later on, Gatsby addes greatly to this conflict.
Perhaps one of the few aspects of the household that gives Daisy and Tom pleasure is the fact that they have an immense house and are able to show off their wealth and feel secure in the money they have.
Later in the book, Fitzgerald writes, "The Buchanans' house floated suddenly toward us through the dark rustling trees." Their house appears very ominous in this scene, and it seems that nothing happy comes from that dark and tense house.