Overheating has become a key problem for building design. The need to reduce energy consumption whilst dealing with global climate change has reduced the options available for building comfortable, low-energy buildings. Research has been directed towards methods for increasing indoor winter temperatures but this can lead to lightweight, highly insulated buildings that respond poorly in the summer. (Source: CIBSE) CIBSE has responded by forming the CIBSE Overheating Task Force. DSM is used to model buildings against CIBSE TM52 targets, mechanical and natural ventilation strategies can be modelled to achieve compliance.