The eco-vector “Energy”, from the point of view of 20 – 20 – 20, relates us the areas around us and allows you to locate the spaces of silence or pleasant sounds in a city. Their determination is not easy because they are scattered in the anonymous noise of eco – diverse mobility vectors, which punts the soundscape o four cities in this century. Speaking of well – being in urban environments and buildings, would be the results of the influence of this eco – vector in the soundscape, which configure urban spaces that allow for recovery against stress and improve the health of its users. The research focuses on the initial results of evaluations conducted for BIA2015 – 63606 – R Project, How much we care about energy qualification…? Selected in the call for Excellence and Challenges Project, funded by the Ministry of Economy and Competitiveness of the Government of Spain.