To make robust judgments of an energy efficiency programme's economic effectiveness, we
need to know how much energy and CO 2 is actually being saved through the financial
support it provides. But most evaluations of home retrofit energy efficiency programmes
depend on calculated, rather than measured, levels of energy consumption. This fails to take
into account the discrepancies that have been observed in practice, between calculated and
actual energy consumption both before and after refurbishment. Evaluations of energy …