* Behind the air conditioning vent in his house: This is where he initially hides the book he steals from the old woman he burns.
* Under the floorboards: He later hides more books under the floorboards of his house.
* In the abandoned house of his former mentor, Professor Faber: Montag ultimately brings all of his books to Faber's house, where he hides them in a secret room that Faber has built.
It's important to note that Guy's hiding places are not always secure, and he faces constant danger of discovery by the authorities. This adds to the tension and suspense of the novel.