Describir: Energy saving in residential building: technologies for retrofitting

 _    _      ___      _  _      ___      ______    ______     _____    _____   
| || | ||   / _ \\   | \| ||   / _ \\   /_   _//  /_   _//   / ___//  |  ___|| 
| || | ||  / //\ \\  |  ' ||  | / \ ||  `-| |,-    -| ||-    \___ \\  | ||__   
| \\_/ || |  ___  || | .  ||  | \_/ ||    | ||     _| ||_    /    //  | ||__   
 \____//  |_||  |_|| |_|\_||   \___//     |_||    /_____//  /____//   |_____|| 
  `---`   `-`   `-`  `-` -`    `---`      `-`'    `-----`  `-----`    `-----`