Abstract: The invention relates to an air conditioning and/or heating system (1) for a vehicle with a housing (5) which comprises at least three housing modules (7, 8) and which houses at least one component (9) of the air conditioning and/or heating system (1), wherein the housing 5 and/or housing part which comprises housing modules (7, 8) contains two housing part end modules (8) and any desired number (n=1, 2, . . . ) of at least one housing part intermediate module, (7) which is positioned between them and is configured with respect to the number and/or the size of the intermediate module(s) of the housing part depending on the structural elements (9) of the air conditioning and/or heating system (1) located between them.