This paper investigates the enduring impacts of Swiss energy efficiency programs on household electricity use and on the continuation of energy-conserving practices. Employing a mixed-methods research design, we analyzed electricity consumption data from 2009 to 2019 and incorporated insights from 2840 survey responses collected in 2018. Findings reveal sustained reductions in electricity use and continued adoption of energy efficient appliances among program participants, underscoring the role of non-financial incentives—particularly environmental awareness—in promoting long-lasting energy conservation behaviors. Socio-cultural factors emerged as more indicative of household energy use than social status. Scaling the results to the national level, we estimate a potential annual energy saving of 2400 GWh, equivalent to 13 % of Swiss household electricity consumption in 2009. The paper advocates energy policies that prioritize engagement and periodic reinforcement to enhance long-term program efficacy.