City-centre and period homes can have smaller rooms, thicker or irregular walls, and little obvious place for pipework. Flats and conversions add leasehold or access questions as well as where the condenser can go. Bedrooms, studies and south-facing rooms in the core are common single-room jobs because the rest of the building is harder to treat as one space.
Outside the historic streets, family houses towards Thanington, the Sturry Road and newer edges of the city are often more straightforward to route, but they still need to be sized for glazing and occupancy. Student and short-term lets around the universities can also need simple controls and a quiet indoor unit, which is a different brief from a suburban family house.