Economists claim that there is a so-called “energy efficiency gap”. What they mean is that many households do not invest in new and more energy-efficient appliances, although this would be financially beneficial for them. In other words: every day millions of people do not see and pick the low hanging fruits of energy-efficiency improvements growing along their way. Several possible explanations have been considered for the existence of the “energy-efficiency gap”, among them various market and behavioural failures such as missing information, liquidity constraints, subjective discount rates and risk aversion, just to name a few. Another possible reason for people to not see and pick the low-hanging fruits is associated with the lack of a specific form of literacy.