To achieve environmental sustainability, energy usage has to be reduced drastically. Reducing energy consumption in the private realm is of prime importance, considering that 27% of all carbon emission stem from domestic households. In order to successfully reduce energy consumption, it is essential to understand what determines the amount of energy used in a household. Stock condition in terms of energy efficiency of the building and occupants' behavioural patterns are of great impact but are often studied in isolation. We conducted a study in which we assessed the success of two behavioural interventions while taking stock condition and psychological variables into account. Fifty five social housing tenants participated in the study. An initial home visit was conducted in spring and summer 2011 during which tenants were interviewed about their behavioural practices regarding home and energy use, their definition of comfort and their comfort actions. Participants also filled in a questionnaire measuring psychological variables such as awareness of consequences of energy consumption, personal norm, and environmental worldview. Participating landlords provided stock condition information, including the Standard Assessment Procedure-Rating (SAP), building fabric and building services information, and floor area of the each dwelling. Participants were split into three groups. Meter readings were collected from each group on a monthly basis. One group, the local benchmarking group, received monthly feedback on their energy consumption in comparison to that of people in their local area. They also received a poster on a monthly basis with information on ways of saving energy by changing behaviour. Energy consumption was normalized by square meter to take the size of a dwelling into account. A second group served as a control group for the local benchmarking group; they came from a similar area but did not receive information on their energy consumption or the posters. A third group received a user-guide with detailed, specific information on how to save energy by behavioural means. The interventions were in place for six months. A second home visit in February 2012 was completed to assess if changes had occurred to the building fabric, home appliances used, lifestyles, and also in psychological variables, such as a greater awareness of environmental issues. Data from the initial visit showed that warmth is the key aspect of comfort, and that money is a motivator for saving energy even though concern for the environment is also high. The presentation will present results of the effectiveness of the interventions, and will show how stock condition, comfort meanings, and psychological variables contribute to the success or non-success of the interventions. The implications of these results for social housing landlords and policy makers are discussed, with emphasis on how to use this information to reduce energy consumption in housing.