chapter 1. Introduction -- chapter 2. Models of models : filtering and bias rings in depiction of knowledge structures and their implications for design -- chapter 3. The Quick Association Check (QuACk) : a resource-light, ’bias robust’ method for exploring the relationship between mental models, and behaviour patterns with home-heating systems -- chapter 4. Case studies of mental models in home heat control : searching for feedback, valve, timer and switch theories -- chapter 5. When energy-saving advice leads to more, rather than less consumption -- chapter 6. Mind the gap : a case study of the gulf of evaluation and execution of home-heating systems -- chapter 7. Using interface design to promote a compatible user mental model of home heating and pilot of experiment to test the resulting design -- chapter 8. Mental model interface design : putting users in control of their home-heating systems -- chapter 9. Conclusion.