“…To what concerns landlords, the PRS across Europe mainly consists of small-scale landlords, which often results in a lack of professionalism, inadequate knowledge regarding energy efficiency issues, and inability to apply for grants or subsidies due to lack of confidence. In addition, landlords' possible mistrust of policy and legislation as well as the presence of a proportion of low-income landlords can also work as barriers to the implementation of energy efficiency policies [68]. Expansion of advice services through greater outreach to affected persons, closer integration of social association advice centres, job centres, and municipal authorities, as well as training relevant employees on how to deal with energy efficiency and energy poverty concerns, are considered beneficial for addressing social barriers [68].…”