The first time that Thrushcross Grange and its residents, the Lintons, are introduced, comes in Chapter Six, when Heathcliff and Cathy spy at Edgar and Isabella through the windows and make fun of what they see. Throughout the novel, Bronte creates a deliberate opposition between the raw, brutal elements and uncivilised savagery of Wuthering Heights and the much more sheltered and protected, refined and civilised presentation of Thrushcross Grange. Heathcliff, because of his character and tempestuous temperament, is much more suited to life at Wuthering Heights, and it is significant therefore that even when he owns Thrushcross Grange he does not choose to live there, choosing instead to stay in the much more inclement and exposed location of Wuthering Heights. Note what he says about his feelings towards Thrushcross Grange in Chapter Six, after scorning Isabella and Edgar for their pettiness:
I'd not exchange, for a thousand lives, my condition here, for Edgr Linton's at Thruscross Grange--not if I might have the privilege of flinging Joseph off the highest gable, and painting the house-front with Hindley's blood!
This is gruesome imagery that perfectly captures his rage and incipient violence, but it also expresses his feelings about Thrushcross Grange and his distaste and scorn for those that live there. Even though these two properties are separated by just a few miles, Bronte makes the reader see that these two locations are separated by much more than mere space, and that they are diametrically opposed in terms of their symbolism.