This study examined the use of thermal imaging as a communication tool that allows householders to ‘see’ where a building is losing heat. The research team tested the effect of tailored and non-tailored thermal images on energy beliefs, behavioural intentions and a simple self-report behaviour question in an English field study. A post-intervention survey (N = 233) indicated that showing occupants any thermal image (tailored or non-tailored) led to higher vividness when recalling the communication, compared to text-only information. Householders engaged with the reports to a greater extent when they were personal to their home: the tailored thermal images were more likely to be shared with others and led to stronger energy saving intentions and reporting energy efficiency behaviour compared to non-tailored reports.