Sabadell executed a domestic energy saving campaign for 29 private dwellings, as voluntary families were granted a Smart-meter (Efergy e2) for a six-months period. The aim of the campaign is to promote co-responsibility of citizens in GEH reduction through awareness raising. Instant information (kWh, kg CO2.eq and euros) provided by the smart-meter allowed the beneficiaries to monitor consumption and implement energy saving practices to promote behavioural change. Housing type under study is a multi-family housing, 76 to 100 m2, with a contracted power/tariff of 4,4 kW and a natural-gas heating system and air conditioning for cooling, with 8,8 kWh of average daily consumption, or GEH emissions of 3.32 kg of CO2. Extremely positive assessment by the beneficiaries were gathered by individual questionnaires and participatory meetings. Savings achieved by families are summed up to 14,3%. Expected CO2 yearly saving for 2020 is 180,6 Tones of CO2 eq as the project will be developed in four phases with an average of 30 dwellings per phase. This campaign has shown extremely positive results in implementing energy saving projects to final domestic energy users. It can replicated everywhere anytime, so it is universal on its application as each family or inhabitant has to improve by themselves its energy profile.