“…We used the Theory of Planned Behaviour (TPB; Ajzen, 1991) as a framework for understanding how residents think about a particular behaviour (e.g., installing cavity wall insulation) and how these thoughts influence decisions about how to act in the future (e.g., whether to adopt and invest in interventions). The TPB is widely researched (for a review, see Armitage & Connor, 2001) and has been used to examine environmental behaviours including intentions to buy environmentally-friendly products (e.g., Kalafatis et al, 1999), energy conservation (Harland, Staats, & Wilke, 1999), wastepaper recycling (Cheung et al, 1999), and use of public transportation (Heath & Gifford, 2002). The TPB suggests that, to understand someone's behavior, you need to understand that individual's attitudes (e.g., whether they think cavity wall insulation would be beneficial), subjective norms (e.g., what their neighbours think that they should do), and perceived behavioural control (e.g., the extent to which people feel that they have control over whether or not to have household energy efficiency interventions).…”