Bradbury uses irony to great effect in the story. Irony in this case means presenting an outcome of a situation that is the opposite of what one would expect. Thus, it is ironic that the same technology which created a house that can cook and clean is also the technology which destroyed all the people on the planet. Furthermore, it is Ironic that such a sophisticated example of technology, the computerized house, can be destroyed by nature, represented by the tree limb which crashes through the window and starts the fire.